A square has a side length of 3x + 5. Which expression is equivalent tothe area of the square minus the perimeter of the square?

Answer 1

For this question, you'll need to find the area of the square AND the perimeter of the square (and then subtract the two).

Area of a square: side length*side length = (3x+5)(3x+5)

After the foiling method, you'll find the area is 9x² + 30x + 25

Perimeter of a square: 4*side length (because all the sides are of equal length) = 4(3x+5) = 12x + 20

Finally you'll need to subtract the perimeter from the area, so 9x² + 30x + 25 - 12x - 20 = 9x² + 18x + 5 (the final answer)