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Factorise: a^2 + 8a - 20
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3 votes
Factorise: a^2 + 8a - 20

User PJT
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2 Answers

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 a² + 8a - 20 = a² + 2*4*a - 20 = a² + 8a + 16 -16 - 20 = (a + 4)² - 36 = (a + 4)² - 6² = (a + 4 - 6)(a + 4 + 6) = (a - 2)(a + 10)
User Lucasvscn
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5.7k points
1 vote
that would be
(a-2)(a+10)
User Rohini Choudhary
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6.7k points
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