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Question

Factorise: 3x3+5x2+3x+5

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Solution

The equation 3x3+5x2+3x+5 can be factorised as follows:

3x3+5x2+3x+5=(3x3+3x)+(5x2+5)=3x(x2+1)+5(x2+1)=(3x+5)(x2+1)

Hence, 3x3+5x2+3x+5=(3x+5)(x2+1)

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