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larisa86 [58]
3 years ago
13

Factorise: a^2 + 8a - 20

Mathematics
2 answers:
dusya [7]3 years ago
8 0
That would be
(a-2)(a+10)
Likurg_2 [28]3 years ago
3 0
 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)
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