Practice problem
What is the square of x+1x+1x+1?
x2+1x^2+1x2+1
x2+x+1x^2+x+1x2+x+1
x2+2x+1x^2+2x+1x2+2x+1
x2−2x−1x^2-2x-1x2−2x−1
Type a concept, like “slope” or “photosynthesis”.
