Question

Identify the vertex for the graph of y = 3x2 + 12x + 5.

A.)(2, 41)

B.)(2, 35)

C.)(−2, −31)

D.) (−2, −7)

Answer 1

First you can change this into vertex form.

Answer 2

Or you can use the shortcut formula..

Answer 3

True that. :D

Answer 4

\[y = ax ^{2}+bx+c\]
value for x coordinate vertex is given by:
x = -b/2a
x = -12/2*3
x = -12/6
x = -2
for y-value substitute in equation:
y = 3*(-2)^2-24+5
y = -7
vertex (-2,-7)

Answer 5

a(x-(-b/2a))^2+c-(b^2/4a)

Answer 6

So yea the vertex turns out to be what you're doing :L

Answer 7

thank you all! ♥