Please help with this question. The length of a rectangle is 5 m more than the width. The area is 176 m^2. Find the length of the rectangle. Show all the works.

Respuesta :

In order to solve this, I will set the width equal to W and the length equal to W + 5.  We can do this because we know that the length is 5 m more than the width.  Because the formula for the area of a rectangle is length * width = area, we can set up this equation.

W * (W + 5) = 176

Now, we solve for W.  We start by distributing the W.

[tex] W^{2} + 5W=176[/tex]

Next, we subtract 176 from both sides.

[tex]W ^{2} +5W-176=0[/tex]

Now, we factor this equation.  When factored, our equation becomes:

[tex](W-11)(W+16)=0[/tex]

The answers to this equation are:

W = 11, -16

The length can not be -16 meters, so it has to be positive 16 meters.  So, the length of this rectangle is 16 meters.