Factorise the following:
15ax3 - 9ax2.
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H.C.F. of 15ax3 and 9ax2 is 3ax2.
∴ 15ax3 - 9ax2 = 3ax2(5x - 3).
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8xy3 + 12x2y2
21py2 - 56py
4x3 - 6x2.
2πr2 - 4πr