Question

Find the equation of the quadratic function F whose graph is shown below.
F(x) = ?

Answer 1

y = x² - 2x - 3

Explanation:

y + 4 = C(x - 1)²

To determine C, use x = 4, y = 5

5 + 4 = C(4 - 1)²

9 = 9C, C = 1

y + 4 = (x - 1)² = x² - 2x + 1

y = x² - 2x - 3