Resolve the following into factors: 1/4 – 1/4x² – 2xy – 4y²
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Answer:
4-(1/4x^2+2xy+4y^2)
=1/4-{1/2x)^2+2.1/2x.2y+(2y)^2}
=(1/2)^2-(1/2 x+2y)^2
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