# math

posted by .

solve and check each of the following quadratic equation
(1)x^2+16x=36
(2)x^2=10x-16
(3)3x=x^2-4

• math -

I'll do one by completing the square. Use the same method for the others. Come on back if you run into trouble.

x^2 + 16x = 36
x^2 + 16x + 64 = 36+64
(x+8)^2 = 100
x+8 = ±10
x = -8 ± 10
x = -18,2

## Similar Questions

1. ### math

use the quadratic formula to solve the equation: x^2+10x-10=0

You know how to solve quadratic equations using algebra, graphs and the quadratic formula. Sometimes one method of solving is more convenient than another method. Describe how you would solve each equation. Give reasons for you answers. …
3. ### Math

Solve the quadratic equation using any technique you wish. Name the technique. Check. 12x2 + 10x = 0
4. ### Math

Solve the quadratic equation using any technique you wish. Name the technique. Check. 12x2 + 10x = 0
5. ### Math

Solve the quadratic equation using any technique you wish. Name the technique. Check. 12x2 + 10x = 0
6. ### math

factoring to solve quadratic equation 5x^2=16x+45
7. ### Math

Solve the equation for x. 30x+10x=40=16x+8
8. ### math

Solve the equation for x 30x+10x-40=16x+8
9. ### 9th grade algebra (completing square)

Can you check the following? A1. (2x + 3)^2 = 25 sqrt(2x + 3)^2 = +-sqrt(25) 2x + 3 = +- 5 2x + 3 = 5, 2x + 3 = -5 2x = 2, 2x = -8 x = 1, x = -4 {-4, 1} A2. x^2 + 14x + 45 = 0 x^2 + 14x + __ = -45 + __ x^2 + 14x + 49 = -45 + 49 (x