The Total solution for NCERT class 6-12
If one zero of the quadratic polynomial x2 + 3x + k is 2, then the value of k is(a) 10(b) -10(c) 5(d) -5
(b) Let the given quadratic polynomial be P(x) = x2 + 3x + kIt is given that one of its zeros is 2P(2) = 0=> (2)2 + 3(2) + k = 0=> 4 + 6 + k = 0=> k + 10 = 0 => k = -10