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Factorisation Using Algebraic Identities

ii Factorise ...

Question

Question 91 (ii)

Factorise the following:

$x^{2} + 9 x + 20$

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Solution

We have, $x^{2} + 9 x + 20$
$= x^{2} + 5 x + 4 x + 5 \times 4 = x (x + 5) + 4 (x + 5) = (x + 5) (x + 4)$

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Factorisation Using Algebraic Identities

Standard VIII Mathematics

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