Chapter 2 Polynomials Ex 2.5 Solutions
Question - 1 : - Use suitable identities to find the following products:
(i) (x+4)(x +10)
Answer - 1 : -
(i)(x+4)(x +10)
Using the identity, (x+a)(x+b) = x 2+(a+b)x+ab
[Here, a = 4 and b = 10]
We get,
(x+4)(x+10) = x2+(4+10)x+(4×10)
= x2+14x+40
(ii)(x+8)(x –10)
Using the identity, (x+a)(x+b) = x 2+(a+b)x+ab
[Here, a = 8 and b = −10]
We get,
(x+8)(x−10) = x2+(8+(−10))x+(8×(−10))
= x2+(8−10)x–80
= x2−2x−80
(iii) (3x+4)(3x–5)
Using the identity, (x+a)(x+b) = x 2+(a+b)x+ab
[Here, x = 3x, a = 4 and b= −5]
We get,
(3x+4)(3x−5) = (3x)2+[4+(−5)]3x+4×(−5)
= 9x2+3x(4–5)–20
= 9x2–3x–20
(iv) (y2+3/2)(y2-3/2)
Using the identity, (x+y)(x–y) = x2–y 2
[Here, x = y2andy = 3/2]
We get,
(y2+3/2)(y2–3/2) = (y2)2–(3/2)2
= y4–9/4
Question - 2 : - Evaluate the following products without multiplying directly:
(i) 103×107
Answer - 2 : -
(i) 103×107
103×107= (100+3)×(100+7)
Using identity, [(x+a)(x+b) = x2+(a+b)x+ab
Here, x = 100
a = 3
b = 7
We get, 103×107 = (100+3)×(100+7)
= (100)2+(3+7)100+(3×7))
= 10000+1000+21
= 11021
(ii) 95×96
95×96 = (100-5)×(100-4)
Using identity, [(x-a)(x-b) = x2-(a+b)x+ab
Here, x = 100
a = -5
b = -4
We get, 95×96 = (100-5)×(100-4)
= (100)2+100(-5+(-4))+(-5×-4)
= 10000-900+20
= 9120
(iii) 104×96
104×96 = (100+4)×(100–4)
Using identity, [(a+b)(a-b)= a2-b2]
Here, a = 100
b = 4
We get, 104×96 = (100+4)×(100–4)
= (100)2–(4)2
= 10000–16
=9984
Question - 3 : - Factorize the following using appropriate identities:
(i) 9x_2+6xy+y_2
(ii) 4y_2−4y+1
_
Answer - 3 : -
(i) 9x2+6xy+y2
9x2+6xy+y2 = (3x)2+(2×3x×y)+y2
Using identity, x2+2xy+y2 = (x+y)2
Here, x = 3x
y = y
9x2+6xy+y2 = (3x)2+(2×3x×y)+y2
= (3x+y)2
= (3x+y)(3x+y)
(ii) 4y2−4y+1
4y2−4y+1 = (2y)2–(2×2y×1)+1
Using identity, x2 – 2xy + y2 =(x – y)2
Here, x = 2y
y = 1
4y2−4y+1 = (2y)2–(2×2y×1)+12
= (2y–1)2
= (2y–1)(2y–1)
(iii) x2–y2/100
x2–y2/100 = x2–(y/10)2
Using identity, x2-y2 = (x-y)(x+y)
Here, x = x
y = y/10
x2–y2/100 = x2–(y/10)2
= (x–y/10)(x+y/10)
Question - 4 : - Expand each of the following, using suitable identities:
(i) (x+2y+4z)_2
(ii) (2x−y+z)_2
(iii) (−2x+3y+2z)_2
(iv) (3a –7b–c)_2
(v) (–2x+5y–3z)_2
(vi) ((1/4)a-(1/2)b +1)_2
Answer - 4 : -
(i) (x+2y+4z)2
Using identity, (x+y+z)2 = x2+y2+z2+2xy+2yz+2zx
Here, x = x
y = 2y
z = 4z
(x+2y+4z)2 = x2+(2y)2+(4z)2+(2×x×2y)+(2×2y×4z)+(2×4z×x)
= x2+4y2+16z2+4xy+16yz+8xz
(ii) (2x−y+z)2
Using identity, (x+y+z)2 = x2+y2+z2+2xy+2yz+2zx
Here, x = 2x
y = −y
z = z
(2x−y+z)2 = (2x)2+(−y)2+z2+(2×2x×−y)+(2×−y×z)+(2×z×2x)
= 4x2+y2+z2–4xy–2yz+4xz
(iii) (−2x+3y+2z)2
Using identity, (x+y+z)2 = x2+y2+z2+2xy+2yz+2zx
Here, x = −2x
y = 3y
z = 2z
(−2x+3y+2z)2 = (−2x)2+(3y)2+(2z)2+(2×−2x×3y)+(2×3y×2z)+(2×2z×−2x)
= 4x2+9y2+4z2–12xy+12yz–8xz
(iv) (3a –7b–c)2
Using identity (x+y+z)2 = x2+y2+z2+2xy+2yz+2zx
Here, x = 3a
y = – 7b
z = – c
(3a –7b– c)2 = (3a)2+(– 7b)2+(–c)2+(2×3a ×– 7b)+(2×– 7b ×– c)+(2×– c ×3a)
= 9a2 + 49b2 + c2–42ab+14bc–6ca
(v) (–2x+5y–3z)2
Using identity, (x+y+z)2 = x2+y2+z2+2xy+2yz+2zx
Here, x = –2x
y = 5y
z = – 3z
(–2x+5y–3z)2 = (–2x)2+(5y)2+(–3z)2+(2×–2x× 5y)+(2× 5y×– 3z)+(2×–3z ×–2x)
= 4x2+25y2 +9z2–20xy–30yz+12zx
(vi)((1/4)a-(1/2)b+1)2
Using identity, (x+y+z)2 = x2+y2+z2+2xy+2yz+2zx
Here, x = (1/4)a
y = (-1/2)b
z = 1
Question - 5 : - Factorize:
(i) 4x2+9y2+16z2+12xy–24yz–16xz
(ii ) 2x2+y2+8z2–2√2xy+4√2yz–8xz
Answer - 5 : -
(i) 4x2+9y2+16z2+12xy–24yz–16xz
Using identity, (x+y+z)2 = x2+y2+z2+2xy+2yz+2zx
We can say that, x2+y2+z2+2xy+2yz+2zx= (x+y+z)2
4x2+9y2+16z2+12xy–24yz–16xz =(2x)2+(3y)2+(−4z)2+(2×2x×3y)+(2×3y×−4z)+(2×−4z×2x)
= (2x+3y–4z)2
= (2x+3y–4z)(2x+3y–4z)
(ii) 2x2+y2+8z2–2√2xy+4√2yz–8xz
Using identity, (x +y+z)2 = x2+y2+z2+2xy+2yz+2zx
We can say that, x2+y2+z2+2xy+2yz+2zx= (x+y+z)2
2x2+y2+8z2–2√2xy+4√2yz–8xz
= (-√2x)2+(y)2+(2√2z)2+(2×-√2x×y)+(2×y×2√2z)+(2×2√2×−√2x)
= (−√2x+y+2√2z)2
=(−√2x+y+2√2z)(−√2x+y+2√2z)
Question - 6 : - Write the followingcubes in expanded form:
(i) (2x+1)3 (ii) (2a−3b)3
(iii) ((3/2)x+1)3 (iv) (x−(2/3)y)3
Answer - 6 : -
(i) (2x+1)3
Using identity,(x+y)3 = x3+y3+3xy(x+y)
(2x+1)3= (2x)3+13+(3×2x×1)(2x+1)
= 8x3+1+6x(2x+1)
= 8x3+12x2+6x+1
(ii) (2a−3b)3
Using identity,(x–y)3 = x3–y3–3xy(x–y)
(2a−3b)3 = (2a)3−(3b)3–(3×2a×3b)(2a–3b)
= 8a3–27b3–18ab(2a–3b)
= 8a3–27b3–36a2b+54ab2
(iii) ((3/2)x+1)3
Using identity,(x+y)3 = x3+y3+3xy(x+y)
((3/2)x+1)3=((3/2)x)3+13+(3×(3/2)x×1)((3/2)x+1)
(iv) (x−(2/3)y)3
Using identity, (x –y)3 = x3–y3–3xy(x–y)
Question - 7 : - Evaluate thefollowing using suitable identities:
(i) (99)3
(ii) (102)3
(iii) (998)3
Answer - 7 : -
(i) (99)3
We can write 99 as 100–1
Using identity, (x –y)3 = x3–y3–3xy(x–y)
(99)3 = (100–1)3
= (100)3–13–(3×100×1)(100–1)
= 1000000 –1–300(100 – 1)
= 1000000–1–30000+300
= 970299
(ii) (102)3
We can write 102 as 100+2
Using identity,(x+y)3 = x3+y3+3xy(x+y)
(100+2)3 =(100)3+23+(3×100×2)(100+2)
= 1000000 + 8 + 600(100 + 2)
= 1000000 + 8 + 60000 + 1200
= 1061208
(iii) (998)3
We can write 99 as 1000–2
Using identity,(x–y)3 = x3–y3–3xy(x–y)
(998)3 =(1000–2)3
=(1000)3–23–(3×1000×2)(1000–2)
= 1000000000–8–6000(1000– 2)
= 1000000000–8- 6000000+12000
= 994011992
Question - 8 : - Factorise each ofthe following:
(i) 8a3+b3+12a2b+6ab2
(ii) 8a3–b3–12a2b+6ab2
(iii) 27–125a3–135a+225a2
(iv) 64a3–27b3–144a2b+108ab2
(v) 27p3–(1/216)−(9/2)p2+(1/4)p
Answer - 8 : -
(i) 8a3+b3+12a2b+6ab2
The expression, 8a3+b3+12a2b+6ab2 canbe written as (2a)3+b3+3(2a)2b+3(2a)(b)2
8a3+b3+12a2b+6ab2 =(2a)3+b3+3(2a)2b+3(2a)(b)2
= (2a+b)3
= (2a+b)(2a+b)(2a+b)
Here, the identity, (x +y)3 = x3+y3+3xy(x+y)is used.
(ii) 8a3–b3–12a2b+6ab2
The expression, 8a3–b3−12a2b+6ab2 canbe written as (2a)3–b3–3(2a)2b+3(2a)(b)2
8a3–b3−12a2b+6ab2 =(2a)3–b3–3(2a)2b+3(2a)(b)2
= (2a–b)3
= (2a–b)(2a–b)(2a–b)
Here, the identity,(x–y)3 = x3–y3–3xy(x–y)is used.
(iii) 27–125a3–135a+225a2
The expression, 27–125a3–135a +225a2 canbe written as 33–(5a)3–3(3)2(5a)+3(3)(5a)2
27–125a3–135a+225a2 =
33–(5a)3–3(3)2(5a)+3(3)(5a)2
= (3–5a)3
= (3–5a)(3–5a)(3–5a)
Here, the identity, (x–y)3 = x3–y3-3xy(x–y)is used.
(iv) 64a3–27b3–144a2b+108ab2
The expression, 64a3–27b3–144a2b+108ab2canbe written as (4a)3–(3b)3–3(4a)2(3b)+3(4a)(3b)2
64a3–27b3–144a2b+108ab2=
(4a)3–(3b)3–3(4a)2(3b)+3(4a)(3b)2
=(4a–3b)3
=(4a–3b)(4a–3b)(4a–3b)
Here, the identity, (x – y)3 = x3 –y3 – 3xy(x – y) is used.
(v) 7p3–(1/216)−(9/2) p2+(1/4)p
The expression, 27p3–(1/216)−(9/2) p2+(1/4)p
can be written as (3p)3–(1/6)3–3(3p)2(1/6)+3(3p)(1/6)2
27p3–(1/216)−(9/2) p2+(1/4)p =
(3p)3–(1/6)3–3(3p)2(1/6)+3(3p)(1/6)2
= (3p–16)3
= (3p–16)(3p–16)(3p–16)
Question - 9 : - Verify:
(i) x3+y3 =(x+y)(x2–xy+y2)
(ii) x3–y3 =(x–y)(x2+xy+y2)
Answer - 9 : -
(i) x3+y3 =(x+y)(x2–xy+y2)
We know that, (x+y)3 = x3+y3+3xy(x+y)
⇒ x3+y3 =(x+y)3–3xy(x+y)
⇒ x3+y3 =(x+y)[(x+y)2–3xy]
Taking (x+y) common ⇒ x3+y3 = (x+y)[(x2+y2+2xy)–3xy]
⇒ x3+y3 =(x+y)(x2+y2–xy)
(ii) x3–y3 =(x–y)(x2+xy+y2)
We know that,(x–y)3 = x3–y3–3xy(x–y)
⇒ x3−y3 =(x–y)3+3xy(x–y)
⇒ x3−y3 =(x–y)[(x–y)2+3xy]
Taking (x+y) common ⇒ x3−y3 = (x–y)[(x2+y2–2xy)+3xy]
⇒ x3+y3 =(x–y)(x2+y2+xy)
Question - 10 : - Factorize each ofthe following:
(i) 27y3+125z3
(ii) 64m3–343n3
Answer - 10 : -
(i) 27y3+125z3
The expression, 27y3+125z3 can bewritten as (3y)3+(5z)3
27y3+125z3 = (3y)3+(5z)3
We know that, x3+y3 = (x+y)(x2–xy+y2)
27y3+125z3 = (3y)3+(5z)3
= (3y+5z)[(3y)2–(3y)(5z)+(5z)2]
= (3y+5z)(9y2–15yz+25z2)
(ii) 64m3–343n3
The expression, 64m3–343n3can be writtenas (4m)3–(7n)3
64m3–343n3 =
(4m)3–(7n)3
We know that, x3–y3 = (x–y)(x2+xy+y2)
64m3–343n3 = (4m)3–(7n)3
= (4m-7n)[(4m)2+(4m)(7n)+(7n)2]
= (4m-7n)(16m2+28mn+49n2)