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Anna35 [415]
3 years ago
8

Factor the trinomial. x^2-4x-5

Mathematics
1 answer:
Morgarella [4.7K]3 years ago
7 0
<h3>Answer: Choice C.  (x+1)(x-5)</h3>

We need to find two numbers that

  • Multiply to -5 (last term)
  • Add to -4 (middle coefficient)

Through trial and error, those two numbers are 1 and -5

  • 1 times -5 = -5
  • 1 plus -5 = -4

So this means x^2-4x-5 factors to (x+1)(x-5)

This is the same as (x-5)(x+1) since the order of multiplication doesn't matter.

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Note that two negatives = one positive

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-4 2/3 is your answer

hope this helps

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