Expand each of the following cubes using suitable denne
a) (2x - 1)
b) - 2
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a). (2x-1)^3
=(2x)^3 - (1^3) - 3 × 2x ×1(2x-1)
=8x^3-1-6x(2x-1)
=8x^3 - 1-12x +6x
=8x^3 - 1-6x
b).-2
= (-2)^3
= -8
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