factorise:- 7a³-56b³
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Answer:x^3+y^3=(x+y)(x^2-xy+y^2)
7a^3+56b^3
=7(a^3+8b^3)
=7[a^3+(2b)^3]
=7(a+2b)[a^2-2ab+(2b)^2]
=7(a+2b)(a^2-2ab+4b^2)
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