Question

If x=3 is a solution of the quadratic equation x2+kx-6=0 then, find the value of k

Answer 1

If x=3 then,
P(3)=3(2)+k(3)-6=0
P(3)=6+3k-6=0
P(3)=6-6+3k=0
i. e- 3k=0
K=0/3

Answer 2

p(x)=3×2+k×3-6
6+k-18
-12+k
k=12
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