Question

if one zero of quadratic polynomial x square-x -(2+2k)is-4 find the value of k​

Answer 1

x×x-x-(2+2k)=-4

xx-x-2-2k=-4

2k=x×x+2

k=x×x

Answer 2

f(x)=x²−x−(2+2k)

one zero is −4

⇒ f(−4)=0

⇒ (−4)²−(−4)−(2+2k)=0

⇒ 16+4=2+2k

⇒ 18=2k

⇒ k=9