callie426
callie426
22-01-2018
Mathematics
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How do I factor this completely?
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zrh2sfo
zrh2sfo
24-01-2018
Factor the following:
a^2 - a - 90
The factors of -90 that sum to -1 are 9 and -10. So, a^2 - a - 90 = (a + 9) (a - 10):
Answer: (a + 9) (a - 10)
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