Question

Write an equation (any form) for the quadratic graphed below

y =

Answer 1

y = 4(x + 1)² - 1

Explanation:

the equation of a quadratic function in vertex form is

y = a(x - h)² + k

where (h, k ) are the coordinates of the vertex and a is a multiplier

here (h, k ) = (- 1, - 1 ), then

y = a(x - (- 1) )² - 1 , that is

y = a(x + 1)² - 1

to find a substitute the coordinates of any other point on the graph into the equation.

using (0, 3 )

3 = a(0 + 1)² - 1 ( add 1 to both sides )

4 = a(1)² = a

y = 4(x + 1)² - 1 ← in vertex form