Question
Factorise:
a3 - 0.064
a3 - 0.064
✓
Answer
a3 - 0.064
= (a)3 - (0.4)3
= (a - 0.4)[(a)2 + a × 0.4 + (0.4)2] Since a3 - b3 = (a - b)(a2 + a × b + b2)
= (a - 0.4)(a2 + 0.4a + 0.16)
= (a)3 - (0.4)3
= (a - 0.4)[(a)2 + a × 0.4 + (0.4)2] Since a3 - b3 = (a - b)(a2 + a × b + b2)
= (a - 0.4)(a2 + 0.4a + 0.16)
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