X^2+3=21

Simple and best practice solution for X^2+3=21 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+3=21 equation: 


Simplifying
X2 + 3 = 21

Reorder the terms:
3 + X2 = 21

Solving
3 + X2 = 21

Solving for variable 'X'.

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

Add '-3' to each side of the equation.
3 + -3 + X2 = 21 + -3

Combine like terms: 3 + -3 = 0
0 + X2 = 21 + -3
X2 = 21 + -3

Combine like terms: 21 + -3 = 18
X2 = 18

Simplifying
X2 = 18

Take the square root of each side:
X = {-4.242640687, 4.242640687}

See similar equations:

| X+50+x+50+x+50+x+50+x+x+x=900 | | x+3=-5-5 | | 3y=6-12 | | 4-9/2=x | | 75x=6 | | 7x+9=7y+8 | | 5/12+-20/12= | | 6d=180 | | U=2(6n+31)+9(n+1) | | 2x+5=8x-10+-12 | | -2.3s=7.08-1.7s | | X+50*4+3x=900 | | -2(-7x+4)+9=(-13) | | 7x-104=31-8x | | x^2-16x+180=0 | | 5=b+a | | -4+5p+1=-8 | | x^2-4x+1=1 | | X+50+x+50+x+50+x+50+3x=900 | | -9(-7x-27)=17 | | 7.44+11.6w=11.2w | | .80x=160 | | x^2-4x+1=2 | | 16-a=11 | | 2-(1-8n)=6n+13 | | 6*k= | | -6(x-2)+4(3-6x)=(-36) | | 8+4x=2y | | h^2+11+30= | | .4x=25 | | 2.3x-1.5=-8 | | 9x+4+4x+11=12x+3 |

Equations solver categories