Question 124661
To find the axis of symmetry, use this formula:


{{{x=-b/(2a)}}}


From the equation {{{y=2x^2+8x-7}}} we can see that a=2 and b=8


{{{x=(-8)/(2*2)}}} Plug in b=8 and a=2



{{{x=(-8)/4}}} Multiply 2 and 2 to get 4




{{{x=-2}}} Reduce



So the axis of symmetry is  {{{x=-2}}}