Factorise the following by using the identities or regrouping the terms:8x³ -343
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Step-by-step explanation:
8x^3 - 343
(2x)^3 - (7)^3
a^3 - b^3
= (a-b) (a^2 + b^2 + ab)
= (2x-7) ((2x)^2 + 7^2 + 2x×7)
= (2x-7) (4x^2 + 49 + 14x)
= (2x -7) (4x^2 + 14x+ 49)
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