Five mark example problems I — task. Mathematics State Board, Class 9.

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Factorise

$x^3 + 13x^2 + 32x + 20$ into linear factors.

Answer:

$x^3 + 13x^2 + 32x + 20 =$

$(x + 1)(x - 2)(x + 10)$
$(x - 1)(x + 2)(x + 10)$
$(x + 1)(x + 2)(x + 10)$
$(x + 1)(x + 2)(x - 10)$

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