Practice problem
Expand: (xy+yz)x(xy+yz)x(xy+yz)x
x2y+yzx^2y + yzx2y+yz
xy+xyzxy + xyzxy+xyz
x2y+xyzx^2y + xyzx2y+xyz
xy+x2yzxy + x^2yzxy+x2yz
Type a concept, like “slope” or “photosynthesis”.
