Write a quadratic function with two real zeros.

The formula for quadratic equation is given by:

x² - (sum) x + (product) = 0

so if we have real roots of 3 and 5

x² - (3 + 5) x + (3*5) = 0

x² - 8 x + 15 = 0

so if we have real roots of - 3 and - 6

x² - (-3 - 6) x + (-2*-6) = 0

x² - (-9 x) + 12 = 0

x² + 9 x + 12 = 0