Find the equation of f(x) graphed below. Homework Help ✎
Identify all of the intercepts.
Write the equation as a factored quadratic since the two values of x are known.
y = (x − 3)(x + 1)
Make the equation negative because the parabola opens downward.
y = −(x − 3)(x + 1)
Use a generic rectangle to multiply the factors together. Distribute the negative.