56. The length of a rectangle is (x + 5) units and its width is (x + 7) units. Which of the following expresses the remaining area of the rectangle, in square units, if a square, x units in length, is removed from the interior of the rectangle?
Your Answer is
Correct Answer is J
Explanation
(x+5)(x+7)-x2=x2+12x+35-x2=12x+ 35