Factorise:-
$a^{2} - 10 a + 21$

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Solution

$a^{2} - 10 a + 21$

$= a^{2} - 7 a - 3 a + 21$

$= a (a - 7) - 3 (a - 7)$

$= (a - 7) (a - 3)$

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Similar questions

a^{2} - 10 a + 25

Factorise :

$a^{2} + 10 a + 24$

a^{2} + 10 a + 25

\frac{a^{2} + 10 a + 21}{a^{2} + 6 a - 7} \times \frac{a^{2} - 1}{a + 3}

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