x^2-81=9

Simple and best practice solution for x^2-81=9 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 x^2-81=9 equation: 


Simplifying
x2 + -81 = 9

Reorder the terms:
-81 + x2 = 9

Solving
-81 + x2 = 9

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 + x2 = 9 + 81

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

Combine like terms: 9 + 81 = 90
x2 = 90

Simplifying
x2 = 90

Take the square root of each side:
x = {-9.486832981, 9.486832981}

See similar equations:

| 5x+1520=24x | | 8*17-y=17 | | 21x-13=12+13x | | 3/5y-2/5=4/5 | | 8*17-y=-7 | | 3y^2+14y+16= | | x+1/4-x-2/3 | | 8*8-y=17 | | 2x-7+2x=3x-5 | | 6x=2x+2/3 | | 2/x+1=-3/2x-3 | | 51+11-x=2 | | 3/5x-4/3x-1=8 | | (-3)(-5)-4(-1)= | | -3x=z/y | | 6(15)=15+5(15) | | y=3x+zforx | | 4(2y-3)-(5y-2)= | | y=1/5(-10)-9 | | 6(x-4)-4(x-1)+9x= | | 4p=8(7p+2) | | (x-5)+2/3x=1 | | 8x+2=3x-5 | | 41+11-x=2 | | 9(2x-6)=7x+1 | | 6x-10y= | | 13x-12=-7x+38 | | 15(17+x)=555 | | (4/3)^-1 | | 1=(1/x-1)((-6/x)+6) | | t^3-9t= | | 5y-15-6=20y-25-5y |

Equations solver categories