If a+b=8andab=15,find a Cube +b cube
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a**3+b**3= (a+b)(a**2-ab+b**2)
a**2+b**2=(a+b)**2 - 2*a*b
a**3+b**3=(a+b)((a+b)**2-3*a*b))=8*(64-3*15)=8*19=152.
a**2+b**2=(a+b)**2 - 2*a*b
a**3+b**3=(a+b)((a+b)**2-3*a*b))=8*(64-3*15)=8*19=152.
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