Question

A library building is in the shape of a rectangle. Its floor has a length of (3x + 5) meters and a width of (5x − 1) meters. The expression below represents the area of the floor of the building in square meters:

(3x + 5)(5x − 1)

Which of the following simplified expressions represents the area of the floor of the library building in square meters?

28x − 5
15x2 − 5
15x2 + 28x − 5
15x2 + 22x − 5

Answer 1

Use the FOIL method

Answer 2

(3x+5)(5x−1)
=(3x+5)(5x+−1)
=(3x)(5x)+(3x)(−1)+(5)(5x)+(5)(−1)
=15x2−3x+25x−5
=15x^2+22x−5

Answer 3

THANK YOUUUUUU :) @sunnychick

Answer 4

No problem my friend :)