Question

The length of a rectangle is represented by 3x, the width is represented by 6x² + 4x, what

is the area of the rectangle? What is the perimeter?

Answer 1

P = 2x(7 + 6x), A = 6x^2(3x + 2)

Explanation:

Area = lw = (3x)(6x^2 + 4x) = 18x^3 + 12x^2 = 6x^2(3x + 2)

Perimeter = 2l + 2w = 2(3x) + 2(6x^2 + 4x) = 6x + 12x^2 + 8x = 14x + 12x^2 = 2x(7 + 6x)