Write a quadratic function with zeros 1 and –9.
Write your answer using the variable x and in standard form with a leading coefficient of 1.
The quadratic function is:
f(x) = (x - 1)(x + 9)
Expanding this function, we get:
f(x) = x^2 + 9x - x - 9
f(x) = x^2 + 8x - 9