Find the value of (x^2 + y^2) if xy= -15 and x-y = 6
Just to inform the answer is 6
so plz explain
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Step-by-step explanation:
x-y=6
squaring both the sides
(x-y)^2=6^2
x^2+y^2-2xy=36
xy=-15 (given)
x^2+y^2+30=36
hence x^2+y^2=6
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