Question

Which function in vertex form is equivalent to f(x) = x^2 + 6x + 3?

f(x) = (x + 3)^2 + 3
f(x) = (x + 3)^2 − 6
f(x) = (x + 6)^2 + 3
f(x) = (x + 6)^2 − 6

Answer 1

Just open the brackets in each choice then compare it with the question equation.

Answer 2

complete the square and you get the solution.