factorise a²+7a-120 tell fast plz
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Answer:
(a-8)(a+15)
Step-by-step explanation:
a²+7a-120 [by the identity: (x+a)(x+b)]
(multiply the coefficients of 1st and last terms)
=1 × 120=120
=factors of 120= 2×2×3×2×5
(now make a pair and multiply try to add or subtract according to the question)
=(a² + 15a) - (8a - 120) pair them as they are four terms
=a(a + 15) - 8(a + 15)
=(a-8)(a+15)
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