When you plug the equation into a graphing calculator the x-intercept is -5
Or you can set the equation equal to 0 and solve for x.
There will be two squares.
Think about it: The shorter side is 3.5 feet. The longer side is 7 feet. If he cuts it in half on the longer side, he's taking the length of that longer side, and dividing it by 2. 7/2=3.5.
So, you'd have two squares, both with a length and width of 3.5 feet.
It would be: k+3 = 10
subtracting 3 from both sides,
k+3-3 = 10-3
k=7
The answer is -6
So you need to drop the word sum on -6