x^2-9=12

Simple and best practice solution for x^2-9=12 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^2-9=12 equation: 


Simplifying
x2 + -9 = 12

Reorder the terms:
-9 + x2 = 12

Solving
-9 + x2 = 12

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + x2 = 12 + 9

Combine like terms: -9 + 9 = 0
0 + x2 = 12 + 9
x2 = 12 + 9

Combine like terms: 12 + 9 = 21
x2 = 21

Simplifying
x2 = 21

Take the square root of each side:
x = {-4.582575695, 4.582575695}

See similar equations:

| 8n-60=4 | | 5+2(n+1)=.2n | | -6=2x^2-7x | | 6a(13+7)=0 | | -24x+36x^2=0 | | 2+x=x^2 | | 8y+3-5y=3-2(y+1) | | 6(5-x)=30 | | 3x+8t=55 | | .5(t+3)=10 | | 4m+3n=9 | | -2-2i=0 | | 0=2x^2-7x+6 | | (5k-10)*-9= | | 0.75(x-16)=-0.25(x-8)+4 | | r^2+7r=-10 | | 12x-4=20fory | | 5x-4(2x-4)+10=10x-2x+5 | | -6y+17=3(y-3)-1 | | 2(x-7)+12=20 | | 11c-5=2(4c+5)+c-3 | | 10+4x=5x-30+33 | | -3n=n-16 | | 6(v+4)-2v=2(2v+2)-6 | | 3x+6(x-10)=3 | | -5v-6=3y+10 | | -1+3x+3x=-73 | | 18x^3-45x^2-27x=0 | | 10+4c=5(x-6)+33 | | a=44-(2a+5) | | -16+12x=12x | | -6(y-5)=3y+48 |

Equations solver categories