Question

The dimensions of a rectangle are x+4 and 3x-1. Write an expression to represent the area of the rectangle.

Answer 1

3x² + 11x - 4

Explanation:

Area = length × width

= (x+4)(3x-1)

= 3x² + 12x - x - 4

= 3x² + 11x - 4

Answer 2

Explanation:

Step 1: Multiply them together to get the area

`A = L * W`

`A = (x + 4)(3x - 1)`

`A = (x * 3x) + (x * -1) + (4 * 3x) + (4 * -1)`

`A = 3x^2 - x + 12x - 4`

`A = 3x^2 + 11x - 4`

Answer:
`A = 3x^2 + 11x - 4`