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Rodney
Mathematics
26 January, 09:15
Factor completely a2 - 9a + 20
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Sandra Murillo
26 January, 09:25
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(a - 5) (a - 4)
You can check, the numbers add up, because - 5 - 4 is 9, and 5 * 4 is 20
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Mohammed Dunlap
26 January, 09:37
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A^2-9a+20=a^2-5a-4a+20 = (a^2-5a) + (-4a+20)
a^2-9a+20=a (a^2/a-5a/a) + (-4) (-4a / (-4) + 20 / (-4))
a^2-9a+20=a (a-5) - 4 (a-5)
a^2-9a+20 = (a-5) [a (a-5) / (a-5) - 4 (a-5) / (a-5) ]
a^2-9a+20 = (a-5) (a-4)
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