Question

what is the value of k if the polynomial x^2+kx-15 with one of its zeroes as 3

Answer 1

Answer:

The value of k in the polynomial $x^{2} +kx-15=0$ is $k=2$.

Step-by-step explanation:

Given $3$ is a zero of the given polynomial, we can write

$x^{2} +kx-15=3^{2}+3k-15=0$

that is   $9+3k-15=0$

thus $-6+3k=0$

          $3k=6$

implies $k=2$.

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