Ifx=a^2+b^2and y=ab+3a-b find x+y and x-y
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Step-by-step explanation:x=a^2+b^2
y=ab+3a-b
x+y=a^2+b^2+2ab-ab+3a-b=(a+b)^2+3a-b-ab
x-y=a^2+b^2-2ab+ab-3a+b=(a-b)^2-3a+b+ab
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