Question

Determine the factors of 5x2 + 6x − 8. (5x − 1)(x + 8) (5x − 8)(x + 1) (5x − 4)(x + 2) (5x − 2)(x + 4)

Answer 1

Answer: The correct option is (C) (5x − 4)(x + 2).

Step-by-step explanation: We are given to determine the factors of the following quadratic expression :

`E=5x^2+6x-8.`

To factorize the given expression, we need to find two integers whose sum is 6 and whose product is -40.

The factorization is as follows :

`E\\\\=5x^2+6x-8\\\\=5x^2+10x-4x-8\\\\=5x(x+2)-4(x+2)\\\\=(5x-4)(x+2).`

Thus, the factors of the given expression are (5x - 4) and (x + 2). That is,

`5x^2+6x-8=(5x-4)(x+2).`

Option (C) is CORRECT.

Answer 2

(5x − 4)(x + 2)

Explanation:

For the purpose, it is sufficient to make sure the middle terms match.

The middle term in the product of each of the answer choices is ...

-1+40 ≠ 6

-8+5 ≠ 6

-4+10 = 6 . . . . . the third selection is the one you want

-2+20 ≠ 6