factorise x³+3/2x³+3/4x+1/8
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x^3+ 3×x^3×1/2+ 3×x×1/2^3. ... (a^3+ 3a^2+ 3ab^2 + b^3
(x+1/2)^3..... ( a+ b )^3
(x+1/2)^3..... ( a+ b )^3
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x³ + 3/2x³ + 3/4x + 1/8
= x³ + 3×x³×1/2 + 3 ×x× 1/2³
= (x + 1/2)³
= x³ + 3×x³×1/2 + 3 ×x× 1/2³
= (x + 1/2)³
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