3 years ago

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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hope this helps

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