(x^2-2x)=20

Simple and best practice solution for (x^2-2x)=20 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^2-2x)=20 equation:


Simplifying
(x2 + -2x) = 20

Reorder the terms:
(-2x + x2) = 20

Remove parenthesis around (-2x + x2)
-2x + x2 = 20

Solving
-2x + x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + -2x + x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -2x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -2x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -2x + x2 = 0 + 20
-2x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-2x + x2 = 20

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 = 20 + 1

Reorder the terms:
1 + -2x + x2 = 20 + 1

Combine like terms: 20 + 1 = 21
1 + -2x + x2 = 21

Factor a perfect square on the left side:
(x + -1)(x + -1) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(x + -1) equal to 4.582575695 and -4.582575695.

Subproblem 1

x + -1 = 4.582575695 Simplifying x + -1 = 4.582575695 Reorder the terms: -1 + x = 4.582575695 Solving -1 + x = 4.582575695 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 = 4.582575695 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.582575695 + 1 x = 4.582575695 + 1 Combine like terms: 4.582575695 + 1 = 5.582575695 x = 5.582575695 Simplifying x = 5.582575695

Subproblem 2

x + -1 = -4.582575695 Simplifying x + -1 = -4.582575695 Reorder the terms: -1 + x = -4.582575695 Solving -1 + x = -4.582575695 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 = -4.582575695 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.582575695 + 1 x = -4.582575695 + 1 Combine like terms: -4.582575695 + 1 = -3.582575695 x = -3.582575695 Simplifying x = -3.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.582575695, -3.582575695}

See similar equations:

| =3h-2 | | (x^2-2)=20 | | =3h*5h | | 22-n=10 | | 14=6+23x-16xsquared | | 26x+8y=1850 | | 3cd*4c*2d= | | 0=5x^2-2x-6 | | 9y+121=-y+11 | | 7(5)+49=5(5)+59 | | 5x-1+2x+5+6x+3= | | 0.058x+x^2= | | Y=tancore | | x^2-2x-1=07 | | 15=7x+5-2 | | -7(n+2)+15=-4n-17 | | 6x+7x+9x=110 | | 3(5p-3)=5(p-11) | | 10.00+2.00t=6 | | x+6=4(2x-5) | | 70x+25-(x-4)+3=72x+5 | | r=8(a+b) | | 7x+35+5x+45=180 | | 5x-8=11x+4 | | 6x+1=45-3x | | 8(g+2)+2(g-2)=76 | | =5*2m | | 6+2x=54 | | 4x=9-4(4x-10) | | 9x+16=58+3x | | 2c+5p=7 | | =m*2m |

Equations solver categories