2x^2-21=-3

Simple and best practice solution for 2x^2-21=-3 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 2x^2-21=-3 equation: 


Simplifying
2x2 + -21 = -3

Reorder the terms:
-21 + 2x2 = -3

Solving
-21 + 2x2 = -3

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 + 2x2 = -3 + 21

Combine like terms: -21 + 21 = 0
0 + 2x2 = -3 + 21
2x2 = -3 + 21

Combine like terms: -3 + 21 = 18
2x2 = 18

Divide each side by '2'.
x2 = 9

Simplifying
x2 = 9

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

See similar equations:

| 3(x+7)-5=19 | | y=-25x-25 | | 9x-23=x+25 | | 8c-c=7 | | 5(-13)+14=3(-13)-12 | | 7m^2=-8m | | 17=0(12)+b | | -7=98 | | 40x^2+10y^2=40 | | 4ln(2x)+3ln(x^3)=8 | | 5(5x+3)=-4(4x-5) | | (24/7)7/3 | | 116-a-44= | | 8=1(20)+b | | -6z=17 | | 14(3.5)-28=4(3.5)+7 | | 6+3z-3=9z+9-4z | | 3+8(5-6x)=13-33x | | .5a=-50 | | 8=-2(b-7)+8 | | X+4x-8=-16 | | 5(5x+3)=4(4x-5) | | 3-2x=5x-7x+3 | | 3x+4x=168 | | 4(a+3)+(-7)=6a+(-21) | | -2=2(q-9) | | q+23=12 | | 3-4(2x+1)=1 | | 3(x+2)=75 | | 7=1(8)+b | | 6y+1+21y+13+x=180 | | 2/5*8.8 |

Equations solver categories