Factorise: x^2- 7x - 30 - Vidyadip

Question

Factorise: $x^2- 7x - 30$

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Answer

$x^2-7 x-30$
$=x^2-10 x+3 x-30$
${-30 = -10 × 3, -7 = -10 + 3}$
$= x(x - 10) + 3(x - 10) $
$= (x - 10)(x + 3)$

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