Question

F(x)=-x^2-9x-7
f(x)=−x
2
−9x−7

f = 3

Answer 1

Assuming the question posed is to find the values of x thtat satisfy the equation f(x) = x^2 - 9x - 7, this is a quadratic equation of the form Ax^2 + Bx + C which has the closed-form solution x = (-b +/- Sqrt[b^2 - 4 ac])/(2a) - widely known as the "quadratic equation."

Explanation:

By applying the quadratic equation, we find that the solutions to this equation are

x = 1/2 * (9-Sqrt[109])

x = 1/2 * (9+Sqrt[109])