2x^2-5x-12=0

Question

solve by completing the square.
please explain how it's sovled.

Answer 1

2x^2-5x-12 = 0
2(x^2 - 5/2) = 12
x^2 - 5/2 = 6
x^2 - 5/2 + (5/4)^2 = 6 + (5/4)^2
(x - 5/4)^2 = 6 + 25/16 = 121/16
x - 5/4 = ±11/4
x = 5/4 ± 11/4
x = 4 or -3/2

Answer 2

In google type :

quadratic equation online

When you see list of results click on :

Free Online Quadratic Equation Solver: Solve by Quadratic Formula

When page be open click on :

Solve by Completing the Square

then type :

2x^2-5x-12=0

and click option :

solve it!

You will see solution step by step

Answer 3

this is so helpful

Answer 4

. 2x² + 5x = 12 *