Please help me on this thank you.

Which function in vertex form is equivalent to f(x) = x2 + 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

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

What is the best estimate of the length of a football