Question
Factorise $: 10x^2 - 9x - 7$
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Answer
$10x^2 - 9x - 7$
$= 10x^2 + 5x - 14x - 7$
$= 5x(2x + 1) - 7(2x+ 1)$
$= (2x + 1)(5x - 7)$
$= 10x^2 + 5x - 14x - 7$
$= 5x(2x + 1) - 7(2x+ 1)$
$= (2x + 1)(5x - 7)$
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