Question

Simplify the expression (4x − 3)(x + 5).

A.
4x2 − 17x + 15
B.
4x2 − 17x − 15
C.
4x2 + 17x + 15
D.
4x2 + 17x − 15

Answer 1

`\text{In this case, you would use FOIL}\\\\\text{FOIL:}\\\\(a+b)(c+d)\\\\\text{First: ac, Inner: bc, Outer: ad, Last:bd}\\\\\text{Solve using FOIL:}\\\\(4x - 3)(x + 5)\\\\4x^2-3x+20x-15\\\\4x^2+17x-15\\\\\boxed{\text{Your answer would be D)/ 4x^2 +17x - 15 }}`

Answer 2

D

Explanation:

(4x-3)(x+5)=x (4x-3)+5 (4x-3)

= 4x^2-3x+ 20x-15

= 4x^2+17x-15