Question

A rectangle has an area of 10x^2-29x-21 square units. Which of the following could represent the primeter of the rectangle in terms of x?
a. 2x-7
b. 5x+3
c. 7x-4
d. 14x-8

Answer 1

area=LW
10x^2-29x-21=area
factor and those are the lengh and width
(2x-7)(5x+3)
perimiter=2(L+W)
P=2(2x-7+5x+3)
P=2(7x-4)
P=14x-8

answer is D