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Factorisation Using Algebraic Identities

Factorize the...

Question

Factorize the following trinomial:
$x^{2} + 10 x + 21$

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Solution

$x^{2} + 10 x + 21$
$= x^{2} + 7 x + 3 x + 21$
$= x (x + 7) + 3 (x + 7)$
$= (x + 3) (x + 7)$

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Factorisation Using Algebraic Identities

Standard VIII Mathematics

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