SOLUTION: The area of a rectangle is given by A = x2 � 2x + 30. Find the value of x if the total area of the rectangle is equal to 45 square units.

Question 655010: The area of a rectangle is given by A = x2 � 2x + 30. Find the value of x if the total area of the rectangle is equal to 45 square units.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
The area of a rectangle is given by A = x2 � 2x + 30. Find the value of x if the total area of the rectangle is equal to 45 square units.
.

since they give A as 45, substitute it in:

factoring:

x = {-3, 5}
throw out the negative solution (extraneous) leaving:
x = 5
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