x^2-21=100

Simple and best practice solution for x^2-21=100 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^2-21=100 equation: 


Simplifying
x2 + -21 = 100

Reorder the terms:
-21 + x2 = 100

Solving
-21 + x2 = 100

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + x2 = 100 + 21

Combine like terms: -21 + 21 = 0
0 + x2 = 100 + 21
x2 = 100 + 21

Combine like terms: 100 + 21 = 121
x2 = 121

Simplifying
x2 = 121

Take the square root of each side:
x = {-11, 11}

See similar equations:

| y=-2x^2+4x-2 | | 0.875-2x=1.75 | | 2=-8y+5(y+4) | | h(t)=20+32t-16t^2 | | 4x+0.9=3 | | 5+5+3=73 | | 5+5+3= | | 9x^2-6x+1=5 | | 9.6=6 | | (x+2x)+(x-3)=57 | | 3x-1*3x-1=5 | | x+2x+x-3=57 | | -15=39-2.25x | | -54=-2.25(x) | | -54=-2.25x | | y-2x+3=-8+x^2 | | 14-5x=-1 | | 12x^2+19x+5= | | 7x+5y=28.42 | | 8+5d=16+3d | | 4x^2-53x-9=0 | | -5x+13=-7 | | -21=-5u | | 2y-3x-3=0 | | x^2+4x+34=-9x+4 | | 4x-5+7x=-38 | | 9+4=7 | | 3(w+4)-6w=21 | | (9p-2)(-2+9p)= | | 10x-(x+1)=20 | | 10x-(x+1)=10 | | 79=x+6x+2 |

Equations solver categories