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Question

Factorise the following: 3x217x+20

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Solution

Given: 3x217x+20
=3x212x5x+20, (split middle term)
=(3x212x)+(5x+20), (group pair of terms)
=3x(x4)5(x4), (factor each binomials)
=(x4)(3x5), (factor out common factor (x4))

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