X^2+7x+21=0

Simple and best practice solution for X^2+7x+21=0 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+7x+21=0 equation:


Simplifying
X2 + 7x + 21 = 0

Reorder the terms:
21 + X2 + 7x = 0

Solving
21 + X2 + 7x = 0

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 + X2 + -21 + 7x = 0 + -21

Reorder the terms:
21 + -21 + X2 + 7x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + X2 + 7x = 0 + -21
X2 + 7x = 0 + -21

Combine like terms: 0 + -21 = -21
X2 + 7x = -21

Add '-7x' to each side of the equation.
X2 + 7x + -7x = -21 + -7x

Combine like terms: 7x + -7x = 0
X2 + 0 = -21 + -7x
X2 = -21 + -7x

Simplifying
X2 = -21 + -7x

Reorder the terms:
21 + X2 + 7x = -21 + -7x + 21 + 7x

Reorder the terms:
21 + X2 + 7x = -21 + 21 + -7x + 7x

Combine like terms: -21 + 21 = 0
21 + X2 + 7x = 0 + -7x + 7x
21 + X2 + 7x = -7x + 7x

Combine like terms: -7x + 7x = 0
21 + X2 + 7x = 0

The solution to this equation could not be determined.

See similar equations:

| 20m^2+52m-24= | | 6+2x^2+x^3+3x=0 | | 40-5x=x-12 | | 0.5x^3-4x^2+8x=0 | | 27+5y-11=17y-113y | | 11(v+4)-3v=2(4v+4)-15 | | 10x+9=9x+11 | | 0.5x=0 | | 64y=7(9y-5) | | 56a^2-17a-3= | | 25x^3-24x+8=0 | | 3z-5=10-2z | | (-1/5)*3= | | 141-5x=5x-21 | | 110-3x=24x+17 | | 121-2x=16x+21 | | X^2+5+20=0 | | -1/5*-1/5*-1/5= | | X^2+1x+1=0 | | 5-9x=63-23x | | 7=5-x | | X^2=5-6x | | 10b^2-29b+10= | | ln(x)+ln(x+6)=ln(7) | | 4x+10-9x=17-15x+10x-7 | | 3(x+2)-2(1-x)=4x+5 | | 5x^2+6x+3=0 | | 120-5x=13x+20 | | 8x-(5x+4)=17 | | 4x-4=13x-74 | | 15b^2-34b+15= | | 7x+80=5(20+x) |

Equations solver categories