Question

if x square+y square =156,x-y=12 then x*y=what

Answer 1

Here is your answer

$x {}^{2} + y {}^{2} = 156 \: \: and \: x - y = 12 \\ \\ now \\ (x - y) { }^{2} = x {}^{2} + y {}^{2} - 2xy \\ (12) {}^{2} = 156 - 2xy \\ - 2xy = 144 - 156 \\ - 2xy = - 12 \\ xy = - 12 \div - 2 \\ xy = 6 \: \: answer$
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