Practice problem
What should ??? be such that we can apply the formula (a+b)(a−b)=a2−b2(a+b)(a-b)=a^2 -b^2(a+b)(a−b)=a2−b2? (k+2)(k+?)(k+2)(k+?)(k+2)(k+?)
−2-2−2
222
kkk
−2k-2k−2k
Type a concept, like “slope” or “photosynthesis”.
