This is very difficult to do without a picture, so hopefully you can follow this explanation....
Draw a square box, then cut it in 1/2 vertically and horizontally so you have 4 smaller squares inside the box (Put in the given terms, outside of the box as shown below).
-5x -3
x | | |
-5 | | |
Now multiply the two outside terms that create the intersection to fill in the box. So
Upper left = -5x2 this is the first term of the polynomial
Upper right = -3x this term and the next term make up the middle term
Lower left = 25x and need to be added together = 22x
Lower right = 15 this is the last term in the polynomial
so your answer should be: -5x2 + 22x + 15
Hopefully this helps you!
