for what value of k, (4+k)2 + (2k - 4)x + (8k + 1) = 0 is a perfect square
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Step-by-step explanation:
=> 8+2k + 2kx - 4x + 8k+1 = 0
=> 10k +2kx = 4x-9
=> 2k( 5 + x ) = 4x-9
=> k = 4x-9 /10+2x
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