x=x^2+4x-8

Simple and best practice solution for x=x^2+4x-8 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=x^2+4x-8 equation:


Simplifying
x = x2 + 4x + -8

Reorder the terms:
x = -8 + 4x + x2

Solving
x = -8 + 4x + x2

Solving for variable 'x'.

Reorder the terms:
8 + x + -4x + -1x2 = -8 + 4x + x2 + 8 + -4x + -1x2

Combine like terms: x + -4x = -3x
8 + -3x + -1x2 = -8 + 4x + x2 + 8 + -4x + -1x2

Reorder the terms:
8 + -3x + -1x2 = -8 + 8 + 4x + -4x + x2 + -1x2

Combine like terms: -8 + 8 = 0
8 + -3x + -1x2 = 0 + 4x + -4x + x2 + -1x2
8 + -3x + -1x2 = 4x + -4x + x2 + -1x2

Combine like terms: 4x + -4x = 0
8 + -3x + -1x2 = 0 + x2 + -1x2
8 + -3x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
8 + -3x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-8 + 3x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 3x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 3x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 3x + x2 = 0 + 8
3x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
3x + x2 = 8

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 8 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 8 + 2.25

Combine like terms: 8 + 2.25 = 10.25
2.25 + 3x + x2 = 10.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(x + 1.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

x + 1.5 = 3.201562119 Simplifying x + 1.5 = 3.201562119 Reorder the terms: 1.5 + x = 3.201562119 Solving 1.5 + x = 3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 3.201562119 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 3.201562119 + -1.5 x = 3.201562119 + -1.5 Combine like terms: 3.201562119 + -1.5 = 1.701562119 x = 1.701562119 Simplifying x = 1.701562119

Subproblem 2

x + 1.5 = -3.201562119 Simplifying x + 1.5 = -3.201562119 Reorder the terms: 1.5 + x = -3.201562119 Solving 1.5 + x = -3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -3.201562119 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -3.201562119 + -1.5 x = -3.201562119 + -1.5 Combine like terms: -3.201562119 + -1.5 = -4.701562119 x = -4.701562119 Simplifying x = -4.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.701562119, -4.701562119}

See similar equations:

| 5x+y+9=0 | | 4+50=x+(x+700) | | x=log(2x^6) | | 3b-2= | | 2(2+3x)=3(3+x)+4 | | 10-2lnx=3 | | x+2(9-8x)=3 | | 2b=-5 | | 14-(6-3x)=4x-x | | 8+6a=-2q+24 | | 5ln(X-4)=7 | | -3n+1=-113 | | x^2-7x-36=0 | | 3y+5=3x+5 | | 2x^2+14x+24= | | 4(3-3x)-8x=15-2(5x-8) | | 16x=13x+45 | | 4r^2-49= | | 17+n-2-6=n+9 | | 5+10-3=4x | | (3x+50)=(7x-10) | | 2y+4=x-10 | | 6b-12=10+8b-4b | | 3(2y-5)= | | 2(x^3-3x^2-3x+9)=0 | | 5y^2-4x^2=20 | | 30a^2b^3c^4-20a^5b^2c^3+10a^3bc^2= | | (6y-16)=(4y+6) | | a+b=4 | | 3r-2+5r=2r+12 | | 10x+3y-9=0 | | (Y-4)(y-7)= |

Equations solver categories