Write y = 2x2 + 8x + 3 in vertex form.

y = 2 * (x +2)² - 5

Step-by-step explanation:

y = 2 * x² + 8x +3          v(h,k)

y = 2 (x-h)² + k = 2x² - 4xh + 2h² + k

8x = -4xh         h = -2

2h² + k = 3    

8 + k = 3      ∴ k = -5

Vertex form : y = 2 * (x +2)² - 5

Step-by-step explanation:

What you need to do is replace x with a number like 1 or 2 in the Equation. Once you do that, you add the seven to the answer and that is your x intercept. Your y Intercept is the 7 in the equation.