Question

If x=3/2 is a zero of the
a zero of the polynomial
2x^2 +k ×-2find the value of k
1) 3
2) 4
3) -5
4) 5
5) other ​

Answer 1

Answer:

2x

${2x}^{2} + kx - 2 \\ = 2( \frac{9}{4} ) + k( \frac{3 - 4}{2} ) \\ = \frac{9}{2} + k( - \frac{ - 1}{2} ) \\ = k( \frac{ - 1}{2} ) = \frac{ - 9}{2 } \\ = k = \frac{ - 9}{2} \times \frac{2}{1} \\ = k = 9$