In the top right corner is -7x since we multiply the x and -7
In the bottom row, we'll have 5x for the first box and -35 for the second box. Each box is the result of multiplying the outer values.
In the top left corner, the x^2 is from multiplying the two copies of x.
Let's set the original price as x.
1/4 off the original price would be
x-1/4x=3/4x
Set it equal to 75
3/4x=75
3x=300
x=100
The original price was $100.
Hope this helps!
