Quadratic Equations and Parabola v1
Parabola Roots
Forget the Quadratic Formula. Find the answers instantly with Desmos.
Practice Challenge Finding Solutions
What are the solutions to the equation \(2x^2 - 8x - 10 = 0\)?
(A) \(x = -1\) and \(x = 5\)
(B) \(x = 1\) and \(x = -5\)
(C) \(x = 2\) and \(x = -10\)
(D) \(x = -2\) and \(x = 10\)
Click to see the "Desmos Speed-Run"
Don't solve algebraically.
1. Type 2x^2 - 8x - 10 = 0 into Desmos.
2. Desmos will plot vertical lines at the exact solutions.
3. Click the gray intersection dots on the x-axis!
Desmos shows (-1, 0) and (5, 0) instantly. The solutions are \(x = -1\) and \(x = 5\). The answer is (A).