Question

factorise a²-25a-84​

Answer 1

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Answer 2

$= {a}^{2} - 25a - 84$

$LCM \: of \: 84, 1 = 2, 2, 3 \: and \: 7$

$= {a}^{2} - 28a + 3a - 84$

$Taking \: out \: common$

$= a(a - 28) + 3(a - 28)$

$=( a + 3)(a - 28)$

Answer.

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