callie426 callie426
  • 22-01-2018
  • Mathematics
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How do I factor this completely?

How do I factor this completely class=

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zrh2sfo
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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