Question

Which of the following is the value of k, if one root of the quadratic equation x2

+ kx - 8 = 0 is -4

a) 0 b) 2

c) 4 d) -4​

Answer 1

Answer:

Hey!

Pls refer to the attatched image for answer.

Answer 2

Answer:

k=2

Step-by-step explanation:

${x}^{2} + kx - 8 = 0 \\ at \: x = - 4 \\ { (- 4)}^{2} + ( - 4)k - 8 = 0 \\ 16 - 4k - 8 = 0 \\8 - 4k = 0 \\ 8 = 4k \\ k = 2$