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

3x+ 5(5x -1)
3x(5x - 1) + 5(5x - 1)
\[15x^{2} - 3x + 25x^{2} - 5\]
\[15x^{2} + 22x -5\]
ans option d