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Question

The following expression 36x2+96xy+64y2 has a solution is (kx+8y)2. Find the value of k.

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Solution

36x2+96xy+64y2

=36x2+64y2+96xy

=(6x)2+(8y)2+2×6x×8x2×6x×8x+96xy

=(6x+8y)296xy+96xy

=(6x+8y)2

Comparing with (kx+8y)2, we get k=6

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