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Misael Santiago
Mathematics
26 December, 17:02
Factorise: a^2 + 8a - 20
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Jordin Riddle
26 December, 17:06
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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)
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Turner Johnston
26 December, 17:23
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That would be
(a-2) (a+10)
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