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Question 2(iv)
Factorise the following expressions
16z+20z3

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Solution

16z=2×2×2×2×z20z3=2×2×5×z×z×zThe common factors are 2,2 and z.16z+20z3=(2×2×2×2×z)+(2×2×5×z×z×z)=(2×2×z)[(2×2)+(5×z×z)]=4z(4+5z2)

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