Write an equation that represents the area.

Solve for all values of x.
What is the length and width of the rectangle?

A rectangle has an area of 40 square units. The length is represented by x-2 and the width is represented by x+4.

3 answers

To find the area of a rectangle, we use the formula A = length x width.

Given that the area is 40 square units, the equation that represents the area is: (x-2)(x+4) = 40

Expanding the equation:
x^2 + 4x - 2x - 8 = 40
x^2 + 2x - 8 = 40
x^2 + 2x - 48 = 0

Now, we can solve for x by factoring or using the quadratic formula. Factoring the equation, we get:
(x+8)(x-6) = 0

Therefore, x = -8, 6

Since the length is represented by x-2 and the width is represented by x+4, we can substitute the values of x into the expressions to find the length and width of the rectangle.

For x = -8:
Length = -8 - 2 = -10
Width = -8 + 4 = -4

For x = 6:
Length = 6 - 2 = 4
Width = 6 + 4 = 10

Therefore, the length and width of the rectangle are 10 units by 4 units.
Are you sure?
Let's recheck the calculations:

Given that the area is 40 square units, the equation that represents the area is: (x-2)(x+4) = 40

Expanding the equation:
x^2 + 4x - 2x - 8 = 40
x^2 + 2x - 8 = 40
x^2 + 2x - 48 = 0

Now, we can solve for x by factoring or using the quadratic formula. Factoring the equation, we get:
(x+8)(x-6) = 0

Therefore, x = -8, 6

Let's plug the values of x in the expressions to find the length and width of the rectangle.

For x = -8:
Length = -8 - 2 = -10
Width = -8 + 4 = -4

For x = 6:
Length = 6 - 2 = 4
Width = 6 + 4 = 10

The length and width of a rectangle cannot be negative, so x = 6 is the valid solution.

Therefore, the length and width of the rectangle are 4 units by 10 units. Thank you for pointing out the error.
Similar Questions
    1. answers icon 1 answer
  1. how to solve this:what is the largest rectangular area that can be enclosed with 400 ft of fencing? What are the dimensions of
    1. answers icon 1 answer
  2. Solve the system of equations using elimination.− 5 x − 3 y = − 13 4 x + 2 y = 12 −5x−3y=−13 4x+2y=12 What is the
    1. answers icon 3 answers
    1. answers icon 1 answer
more similar questions