Question

find the value of k if x=2 is solution of kx2+2x-9=0

Answer 1

sub x=2 in
kx2+2x-9=0
4k+4-9=0
4K=5
k=5/4

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Answer 2

kx^2+2x-9
we have x=2
k×2^2+2×2-9
4k+4-9
4k=5
k=5/4