Factorise the following:
21py2 - 56py
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H.C.F. of 21py2 and 56py is 7py.
∴ 21py2 - 56py = 7py(3y - 8).
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8xy3 + 12x2y2
15ax3 - 9ax2.
4x3 - 6x2.
2πr2 - 4πr