Factorise:27-125a3-135a+225a2
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(a-b)^3 = a^3 - b^3 -3*a^2*b + 3* a* b^2
27 - 124a3 - 135a + 225a2
= 3^ 3 - (5a)^3 - 3* 3^2* 5a + 3* 3* (5a)^2
= (3-5a)^3
= (3-5a)(3-5a)(3-5a)
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