Which expression is equivalent to 2(3 – x) – 12 + 4x?

Find the vertex of the function given below y=x^2-6x+1

What are “like terms”? why can we only add like terms?

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241