What is the axis of symmetry for f(x) = −2x2 + 20x − 42?

The axis of symmetry is x=5

Step-by-step explanation:

Given function is :

f(x)=

We can use the formula for the axis of symmetry.

Therefore, the axis of symmetry is x=5

Axis of symmetry is the line of symmetry of a parabola that divides it into two equal halves. These halves are reflections of each other about the line of symmetry.

if you was gonna solve for a, a is a   < -12