If a+b=11 and ab=28 find the volume of a cube+ b cube
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a^3+b^3=(a+b)^3-3ab(a+b)
=(11)^3-3*28(11)
=1331-84(11)
=1331-924
=407
=(11)^3-3*28(11)
=1331-84(11)
=1331-924
=407
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