Question

find the axis of symmetry for y=3x^2+5x-7
a)x=5
b)x=-5/3
c)x=-7
d)x=-5/6

Answer 1

What is the x coordinate of the vertex?

Answer 2

it dosnt give me one

Answer 3

sure, you have to find it out

Answer 4

by formula x = -b/2a

Answer 5

huh im so sorry im wakeful at this lol

Answer 6

awful*

Answer 7

\[y =3x^2+5x -7\]

do you know how to do the completing the square? Look at the attachment, it briefly shows you how to do it.

So If I complete the square given in the question then it will be

\[y = 3(x + \frac{ 5 }{ 3 })^2-\frac{ 25 }{ 9 } - 7\]

the x you see in this equation has to be to which if you add 5/3 will give you 0
Sp bring 5/3 to the other side

\[x = -\frac{ 5 }{ 3 }\]

back to the original equation so when x is -5/3 your y will be:
\[y = -\frac{ 88 }{ 9 }\]

the x is the line of symmetry