Question

find the value of k if the equation (k4)x²+2(k-4)x has real and equal roots
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Answer 1

for equal roots b^2-4ac=0

then

substituting values

[2(k-4)]^2-4×0×4k=0

4k^2+64-32k=0

(k-4)(k-4)

k=4

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