Question

What is the line of symmetry for y=2x^2+3x+1

Answer 1

-3/4

To find this, use the equation -b/2a.

In this equation, a is 2, b is 3, and c (although not used) is 1.

Thus, inputting this in the equation will give you the above answer.

Hope this helps!

Answer 2

Hi! The formula for the axis of symmetry, or x = num, the folding point - is:

$\frac{-b}{2a}$

This equation is in standard form,

$ax^2 + bx + c$

where a = 2

and b = 3

Plug these numbers into the equation:

$\frac{-3}{2(2)} = -\frac{3}{4} = -.75$

The axis of symmetry is:

$x = -.75$