(x+1 by 2)(x+3 by 2)
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Answer:
4x²+12
Step-by-step explanation:
= [(x+1)/2][(x+3)/2]
∴by cross multiplication
=[2(x+1)][2(x+3)]
=[2x+2][2x+6]
=[2x*2x]+[2*6]
=4x²+12
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