Question

http://prntscr.com/8nixmo

Answer 1

the x co-ordinate of the vertex of \(\Large y= ax^2+ bx+c\)
is just
\(\Large \dfrac{-b}{2a}\)

Answer 2

so compare 2x^2 + 2x -3 with ax^2 +bx +c
and find the a,b,c values!

Answer 3

a = 2, b= 2, c =-3

Answer 4

very good!

and whats -b/2a = ... ?

that will be your answer :)

Answer 5

-1/2

Answer 6

\(\Huge \checkmark \)