The Total solution for NCERT class 6-12
Answer - 1 : -
(i) x(y-z)+4 (y-z)हल :x(y – z) + 4 (y – z)= (y – z) (x + 4)
(ii) 2(5 + b)-7 (5+ b)हल :2(5 + b) -7 (5 + b)= (5 + b) (2 – y)=-5(5 + b)
(iii) y(a2 +x) – a2 = x)हल :y(a2 + x) – a2 =x)= (a2 + x) (y- 1)
(iv) a(a + 3) -5 (3 + a)हल :a(a + 3) -5 (3 + a),= (a + 3) (9 – 5)
Answer - 2 : -
(i) x3 +2x2 = 5x + 10हल :x3 + 2x2 +5x + 10= x2(x + 2) + 5(x + 2)= (x + 2) (x2 + 5)
(ii) 3ax – 6xy + 8by – 4abहल :3ax – 6xy + 8by – 4ab= 3ax – 6xy -4ab + 8by= 3x (a – 2y) – 4b (a – 2y)= (a – 2y) (3x – 4b)
(iii) ax + cx’ + ay-bx + cyहल :ax2 + cx2 +ay2 – by2 –bx2 +cy2= ax2 – bx2 +cx2 + ay2 –by2 + cy2= x2 (a – b + c) + y2 (a– b + c)= (a – b + c) (x2 + y2)
(iv) ab2 –(a-c) b-cहल :ab2 – (a – c) b – c= ab2 – ab + bc – c= ab (b – 1) + c(b – 1)= (b – 1) (ab + 1)
(v) p2q – pr2 –pq + r2हल :p2q – pq2 –pq + r2=pq (p – 1) – r2(p – 1)= (p – 1) (pq – r2)
Answer - 3 : -
50x2y + 10y2x +30xy + 6y2= 10y2x + 50x2y + 6y2 +30xy= 10xy (y + 5x) + 6y (y + 5x)= (y + 5x) (10xy +6y)यदि x =1, तथा y = 2 रखने पर= (x +5 × 1) (10 × 1 × 2 + 6 × 2)= (2 + 5) (20 + 12)=7 × 32 = 224
Answer - 4 : -