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3 votes
Which expression completes the factored form of this quadratic expression? x2 + 4x – 5

(x-1)
(x+1)
(x+4)
(x-4)
(x+3)

1 Answer

3 votes
Find factors of -5 that, when added together, will give 4

x² + 4x - 5
x 5
x -1

(x + 5)(x -1)

Using the FOIL method (First, Outside, Inside, Last), we can get the question again.

x(x) = x²
x(-1) = -x
5(x) = 5x
5(-1) = -5

x² - x + 5x - 5
x² + 4x - 5


(x + 5) (x - 1) is your answers

however, i believe it is only asking for one. Therefore, because (x - 1) is a choice, (x - 1) should be your answer

hope this helps
User Rajeesh Menoth
by
7.6k points

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