8x^2+21=-21

Simple and best practice solution for 8x^2+21=-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 8x^2+21=-21 equation:


Simplifying
8x2 + 21 = -21

Reorder the terms:
21 + 8x2 = -21

Solving
21 + 8x2 = -21

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 + 8x2 = -21 + -21

Combine like terms: 21 + -21 = 0
0 + 8x2 = -21 + -21
8x2 = -21 + -21

Combine like terms: -21 + -21 = -42
8x2 = -42

Divide each side by '8'.
x2 = -5.25

Simplifying
x2 = -5.25

Reorder the terms:
5.25 + x2 = -5.25 + 5.25

Combine like terms: -5.25 + 5.25 = 0.00
5.25 + x2 = 0.00

The solution to this equation could not be determined.

See similar equations:

| n^2-7=448 | | 3000-120x=24.975 | | 4-4m=4m | | x+(x+35)+(2x-40)=667 | | x+x+23+(x+23/4)=562 | | 7(24/7)= | | 9s=-8s+10 | | 9[7-9(-5x-6)]=405x+549 | | 3p^3-4p^2-192p+256=0 | | n^2+7=448 | | 1/4(2t-6) | | 2(x+6)/3=5x-1 | | y-3y+9=2 | | 4x^4-10x^3-2x^2=0 | | 2/3(t+4) | | 4y=-3y+10 | | m/6=-18 | | 7d+6=10d | | x+x+23+(x+23)/4 | | x+25-9x=17-6x | | 8g-5g-4=-3+3g | | x^4+34x+224=0 | | w-8.69=4.14 | | 16n^2-8n=15 | | 2/7(15x+4)=1/2(9x-28)+13 | | x+x+23+x+23/4 | | x+x+300000=625000000 | | (6x+3)/(8)*(12)/(2x+1) | | x-0.20x=40 | | x+2+8x=4x-1 | | X^3-36x=16(x-6) | | 4x-6=-6-4x |

Equations solver categories