If x-y = 2 , and xy = 15 fínd x square +y square and x cube - y cube
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x²+y²
=(x-y)²+2xy
=2²+2.15
=4+30
=34
x³-y³
=(x-y)³+3xy(x-y)
=2³+3.15.2
=8+90
=98
=(x-y)²+2xy
=2²+2.15
=4+30
=34
x³-y³
=(x-y)³+3xy(x-y)
=2³+3.15.2
=8+90
=98
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