Mathematics

Problem

A rectangle has length

6

cm more than its width and area

40

^2

. The equation

x^2+6x-40=0

is obtained for the width

x

(in cm). The solutions are

x=4

and

x=-10

. Which option correctly identifies the width of the rectangle? a)

-10\text{ cm}

4\text{ cm}

10\text{ cm}

5\text{ cm}