x^2-2x+8=20

Simple and best practice solution for x^2-2x+8=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+8=20 equation:


Simplifying
x2 + -2x + 8 = 20

Reorder the terms:
8 + -2x + x2 = 20

Solving
8 + -2x + x2 = 20

Solving for variable 'x'.

Reorder the terms:
8 + -20 + -2x + x2 = 20 + -20

Combine like terms: 8 + -20 = -12
-12 + -2x + x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-12 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -2x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -2x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -2x + x2 = 0 + 12
-2x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-2x + x2 = 12

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 = 12 + 1

Reorder the terms:
1 + -2x + x2 = 12 + 1

Combine like terms: 12 + 1 = 13
1 + -2x + x2 = 13

Factor a perfect square on the left side:
(x + -1)(x + -1) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(x + -1) equal to 3.605551275 and -3.605551275.

Subproblem 1

x + -1 = 3.605551275 Simplifying x + -1 = 3.605551275 Reorder the terms: -1 + x = 3.605551275 Solving -1 + x = 3.605551275 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 = 3.605551275 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.605551275 + 1 x = 3.605551275 + 1 Combine like terms: 3.605551275 + 1 = 4.605551275 x = 4.605551275 Simplifying x = 4.605551275

Subproblem 2

x + -1 = -3.605551275 Simplifying x + -1 = -3.605551275 Reorder the terms: -1 + x = -3.605551275 Solving -1 + x = -3.605551275 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 = -3.605551275 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.605551275 + 1 x = -3.605551275 + 1 Combine like terms: -3.605551275 + 1 = -2.605551275 x = -2.605551275 Simplifying x = -2.605551275

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.605551275, -2.605551275}

See similar equations:

| b(y-b)=d(y-d) | | -5a-3a-7= | | -2+3(-6y-7)=-5(-5y-1)+2 | | 6=3+y | | x^2+3x-7=32 | | x^2+x+10=35 | | x^2+3x+4=16 | | x+10=24-x | | x^2+x-7=3 | | x^2+x-7=14 | | 0=44x^2-88x+74 | | 0=44x^2-88t+74 | | x^3+3=14 | | 24=4m | | -7(2x+3)+11x= | | x^2+2x+1=40 | | G=9/2(p-67) | | x=1-13/5 | | 5x+13y+5=0 | | -11-(-15)= | | -3(4r-80)=-36 | | 180=4/(x-4) | | y=2(x-7) | | w-(4/2/5)=(9/3/5) | | 11-x=19 | | 13+w/7 | | (m-3)=5 | | 7y+14=-15y+10+6y | | 16x+42-13x=20+4 | | 10a+a-7a= | | X/3+3=x/2+2 | | 2=(n+1) |

Equations solver categories