Question

If 3 is a zero of the polynomial 2x² + x + k, find the value of k.

Answer 1

Given: x = 3 is one zero of the polynomial 2x² + x + k

Therefore, it will satisfy the above polynomial.

Now, we have

2(3)² + 3 + k = 0

⇒ 21 + k = 0

⇒ k = –21