Question

find the value of k for which x= - 2 is a root of the quadratic equations kx 2 + x - 6 = 0​

Answer 1

if x = -2

Then,

kx² + x - 6 = 0

k(-2)² + (-2) - 6 = 0

4k - 2 - 6 = 0

4k - 8 = 0

4k = 8

k = 8/4

k = 2

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