heerinfgsd
heerinfgsd
09-02-2017
Mathematics
contestada
Factorise: a^2 + 8a - 20
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toriking098
toriking098
09-02-2017
that would be
(a-2)(a+10)
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yacine78941
yacine78941
09-02-2017
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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