x^2-2*x-4=0

Simple and best practice solution for x^2-2*x-4=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^2-2*x-4=0 equation:


Simplifying
x2 + -2x + -4 = 0

Reorder the terms:
-4 + -2x + x2 = 0

Solving
-4 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -2x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -2x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -2x + x2 = 0 + 4
-2x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-2x + x2 = 4

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 4 + 1

Reorder the terms:
1 + -2x + x2 = 4 + 1

Combine like terms: 4 + 1 = 5
1 + -2x + x2 = 5

Factor a perfect square on the left side:
(x + -1)(x + -1) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(x + -1) equal to 2.236067978 and -2.236067978.

Subproblem 1

x + -1 = 2.236067978 Simplifying x + -1 = 2.236067978 Reorder the terms: -1 + x = 2.236067978 Solving -1 + x = 2.236067978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 2.236067978 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.236067978 + 1 x = 2.236067978 + 1 Combine like terms: 2.236067978 + 1 = 3.236067978 x = 3.236067978 Simplifying x = 3.236067978

Subproblem 2

x + -1 = -2.236067978 Simplifying x + -1 = -2.236067978 Reorder the terms: -1 + x = -2.236067978 Solving -1 + x = -2.236067978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -2.236067978 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.236067978 + 1 x = -2.236067978 + 1 Combine like terms: -2.236067978 + 1 = -1.236067978 x = -1.236067978 Simplifying x = -1.236067978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.236067978, -1.236067978}

See similar equations:

| 51=-5x+2(5x+3) | | -(4x+v)+2(v+2x)= | | 6(4+p)-3p=2(p+4) | | 9=2.7*1.13x | | -2=-5x+2(3x-5) | | 2*x^2+3*x+3=0 | | 28/y=4/7 | | 4y+3x-2y+4x= | | 20=0.029x+45.3 | | 18a^10/2a^4 | | 2(8x+2)=10(8x+8) | | 12y-3y^2-3x^2=0 | | 3*x^2+3*x-36=0 | | vy-6v+vy-2v= | | V+2=2v+2 | | 2x+-x-2(-2x+4)=3x | | 5+3(x-7)=4x-23 | | Y=0.029x+45.3 | | -3*x^2-24*x-48=0 | | 4x^3-8x-34=0 | | -2(y-w)-2(-3w-2y)= | | 3n-2n-1=9 | | 4(-8-7k)= | | sec^2(x)+4=6 | | 3*x^2+15*x+18=0 | | 5(-8d+4)= | | 4444x+456578=x | | 2=r-6/4 | | 3(-8-5n)+5(6+3n)=-n+2n | | 3(w-2)=39 | | -2*x^2-8*x-8=0 | | -3(7+8q)+9q= |

Equations solver categories