Factorise the following:
4x3 - 6x2.
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H.C.F. of 4x3 and 6x2 is 2x2.
∴ 4x3 - 6x2 = 2x2(2x - 3).
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15ax3 - 9ax2.
21py2 - 56py
2πr2 - 4πr
18m + 16n