Factorise the following:
8xy3 + 12x2y2
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H.C.F. of 8xy3 and 12x2y2 is 4xy2.
∴ 8xy3 + 12x2y2 = 4xy2(2y + 3x).
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15ax3 - 9ax2.
21py2 - 56py
4x3 - 6x2.
2πr2 - 4πr