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How do I factor this completely?
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How do I factor this completely?

How do I factor this completely?-example-1
User Dominix
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1 Answer

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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)
User RGRGRG
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