14
QuizMultiple Choice
Unit Test
Question 14 of 25 • Algebra I
The first three steps in writing f(x) = 40x + 5x2 in vertex form are shown.Write the function in standard form.f(x) = 5x2 + 40xFactor a out of the first two terms.f(x) = 5(x2 + 8x)Form a perfect square trinomial. = 16 f(x) = 5(x2 + 8x + 16) – 5(16)What is the function written in vertex form?
Answer
A
f(x) = 5(x + 4) – 80B
f(x) = 5(x + 8) – 80C
f(x) = 5(x + 4)2 – 80D
f(x) = 5(x + 8)2 – 80