### Home > PC3 > Chapter 4 > Lesson 4.1.1 > Problem 4-15

4-15.

Consider the quadratic equation .

Is

a solution to the equation? How can you be sure without solving?Substitute it into the equation.

Without solving, predict another solution to the equation. Verify your prediction by checking it.

Review the solutions to the equation in problem 4-8.

Where does the parabola

intersect the‑axis? Explain.The roots are complex numbers.

Note: You can graph the function on a calculator to check.