SOLUTION: A rectangle has a length of x+3 and a width of x-3, and has an area of 40 square units. find the length and width of the rectangle

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: A rectangle has a length of x+3 and a width of x-3, and has an area of 40 square units. find the length and width of the rectangle      Log On


   

Question 599545: A rectangle has a length of x+3 and a width of x-3, and has an area of 40 square units. find the length and width of the rectangle
Answer by w_parminder(53) About Me  (Show Source):
You can put this solution on YOUR website!
Area of rectangle = length*width
So (X + 3)*(X - 3) = 40
i.e. (X^2 - 9) = 40
X^2 = 40 + 9
X^2 = 49
X = sqrt(49)
X = 7
So length = 7 + 3 = 10 units &
width = 7 - 3 = 4 units