Question

For what value of k, is 3 a zero of the polynomial 2x² + x + k?

Answer 1

$\text{Let P(x)=}2x^2+x+k$

$\textbf{Given: 3 is a zero of P(x)}$

$\text{Then, P(3)=0}$

$\implies\,2(3)^2+3+k=0$

$\implies\,18+3+k=0$

$\implies\boxed{\bf\,k=-21}$

$\therefore\textbf{The value of k is -21}$

Find more:

1.Find the value is of a and b, if x²-4 is a factor of ax⁴+2x³ -3x²+bx-4.

https://brainly.in/question/15904227#

2.Find the value is of a and b, so that (x+1) and (x-1) are factors of x⁴+ax³-3x²+2x+b.

https://brainly.in/question/15904634