81-9x^2=0

Simple and best practice solution for 81-9x^2=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 81-9x^2=0 equation: 


Simplifying
81 + -9x2 = 0

Solving
81 + -9x2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-81' to each side of the equation.
81 + -81 + -9x2 = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -9x2 = 0 + -81
-9x2 = 0 + -81

Combine like terms: 0 + -81 = -81
-9x2 = -81

Divide each side by '-9'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

See similar equations:

| y=5x^2-9x+1 | | 45u^2-20u^4=0 | | 4m-8/3=2m-6 | | 4v^4-100v^2=0 | | 5x+3=10x+53 | | 48w^2-75=0 | | 7x+2/4=13x-2/6 | | 4x=5+6 | | 36v^2-9v^4=0 | | 18-3w=5g-11 | | 28w-63w^3=0 | | 9x^2+7x+2=0 | | 4u^2-100=0 | | 25t*-40t+16=0 | | 6y^6-20y^5+14y^4=0 | | 3x^7+15x^6+27x^5=0 | | 4x^6-28x^5+49x^4=0 | | 4v^4-22v^3-12v^2=0 | | 8v^6-12v^5-36v^4=0 | | -2u^2-2u+24=0 | | -3v^2-14v-15=0 | | 25t*-40t=-16 | | 5x^2-14xy+8y^2=0 | | 12y^2-32y+21=0 | | 10y^2+21y+9=0 | | 9y^2+18y-16=0 | | 2y^2+19y+30=0 | | 4x-7=5x-1 | | 3z^2+28z-20=0 | | -y-1=-15+3/4y | | 6x-1=5x+5 | | x^3-4x-30=0 |

Equations solver categories