Practice problem
Simplify (2−r)(3+3r)(2 - r)(3 + 3r)(2−r)(3+3r) by foiling.
5r2+2r+55r^2 + 2r + 55r2+2r+5
6−3r+3r26 - 3r + 3r^26−3r+3r2
6r2−6r+66r^2 - 6r + 66r2−6r+6
6+3r−3r26 + 3r - 3r^26+3r−3r2
Type a concept, like “slope” or “photosynthesis”.
