x^2-4x=-2

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


Simplifying
x2 + -4x = -2

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

Solving
-4x + x2 = -2

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

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

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

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

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

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

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

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

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

Factor a perfect square on the left side:
(x + -2)(x + -2) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(x + -2) equal to 1.414213562 and -1.414213562.

Subproblem 1

x + -2 = 1.414213562 Simplifying x + -2 = 1.414213562 Reorder the terms: -2 + x = 1.414213562 Solving -2 + x = 1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 1.414213562 + 2 Combine like terms: -2 + 2 = 0 0 + x = 1.414213562 + 2 x = 1.414213562 + 2 Combine like terms: 1.414213562 + 2 = 3.414213562 x = 3.414213562 Simplifying x = 3.414213562

Subproblem 2

x + -2 = -1.414213562 Simplifying x + -2 = -1.414213562 Reorder the terms: -2 + x = -1.414213562 Solving -2 + x = -1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -1.414213562 + 2 Combine like terms: -2 + 2 = 0 0 + x = -1.414213562 + 2 x = -1.414213562 + 2 Combine like terms: -1.414213562 + 2 = 0.585786438 x = 0.585786438 Simplifying x = 0.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.414213562, 0.585786438}

See similar equations:

| 2x+29=5x+20 | | x^2-2x+1=2 | | [3x+5]-6=36 | | (x-4)+y+4(x-4)=62 | | x^2-6x+9=5 | | 20y^2-y-30=0 | | y=x^2-3x-10 | | (x-4)+x+4(x-4)=62 | | 3g^2+8G+4= | | [2x-4]=20 | | 16=4[n-5]+4 | | 3x^2-5x=372 | | 8x(8x)-15x-2=0 | | a(14a+5)=9 | | 8x-16=0 | | 3x(3x)+8x-16=0 | | b(13b+4)=9 | | 19-6x=9+4x | | 9z^2=-6 | | 87+3= | | 6(2+3z)=3(4+6z) | | 2h-8=h+7 | | 10c^2-21c=-4c+6 | | x^2-8x+16=8 | | 48-6x=3x+20 | | X^3-7x^2+12x=0 | | x+43= | | -4x=48 | | x^2-14x+49=9 | | 137-6x=3x+11 | | 8x+9-7x=12 | | 3(2x+3)=9x-19 |

Equations solver categories