find a value for k that will make 4x^2 + 6.4x + k a perfect square. again this stuff is kicking my behind

1 answer

(2x + 1.6)^2 = 4x^2 + 6.4x + 1.6^2,

so if you make k = 1.6^2 = 2.56, you have a perfect square

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