Find k in 9x 2 3kx 4 if is a expression kx^2-3kx+9
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given 9x-3kx+k=0
let a=9, b= -3k, c=k
b2-4ac=0
(-3k)2-4*9*k=0
9k2-36k=0
9k(k-4)=0
9k=0 or k-4=0
hence k=0 or k=4
let a=9, b= -3k, c=k
b2-4ac=0
(-3k)2-4*9*k=0
9k2-36k=0
9k(k-4)=0
9k=0 or k-4=0
hence k=0 or k=4
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