Practice problem
(3x+7)2=(3x+7)^2=(3x+7)2=
9x2+21x+499x^2+21x+499x2+21x+49
9x2−21x+499x^2-21x+499x2−21x+49
9x2+42x−499x^2+42x-499x2+42x−49
9x2+42x+499x^2+42x+499x2+42x+49
Type a concept, like “slope” or “photosynthesis”.
