Question

On a coordinate plane, a parabola opens up. Solid circles appear on the parabola at (negative 3, 12.5), (negative 2, 5), (negative 1, 0.5), (0, negative 1), (1, 0.5), (2, 5), (3, 12.5).

The graph of f(x) is shown. Estimate f(–3).
f(–3) =

Answer 1

D. 12.5

Explanation:

Answer 2

12.5

Explanation:

Vetrx is at: (0,-1) because other y values are repeated

y = a(x - 0)² - 1

y = ax² - 1

Using (1,0.5)

0.5 = a(1)² - 1

a = 1.5

f(x) = 1.5x² - 1

f(-3) = 1.5(-3)² - 1

f(-3) = 12.5