Question

What is the factored form of x2 - 4x - 5?

ОООО
о(х + 5)(х – 1)
о(х+ 5)(х + 1)
О(х - 5)(х – 1)
О (х – 5)(х + 1)

Answer 1

(x-5) (x+1)

Explanation:

x^2 -4x -5

What two numbers multiply to -5 and add to -4

-5*1 = -5

-5+1 = -4

(x-5) (x+1)

Answer 2

Option D, (x - 5)(x + 1)

Explanation:

Step 1: Factor

`x^2 - 4x - 5`

`x^2 - 5x + x - 5`

`(x - 5)(x + 1)`

Answer: Option D, (x - 5)(x + 1)