x^2+2x=23

Simple and best practice solution for x^2+2x=23 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=23 equation:


Simplifying
x2 + 2x = 23

Reorder the terms:
2x + x2 = 23

Solving
2x + x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + 2x + x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + 2x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + 2x + x2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + 2x + x2 = 0 + 23
2x + x2 = 0 + 23

Combine like terms: 0 + 23 = 23
2x + x2 = 23

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 = 23 + 1

Reorder the terms:
1 + 2x + x2 = 23 + 1

Combine like terms: 23 + 1 = 24
1 + 2x + x2 = 24

Factor a perfect square on the left side:
(x + 1)(x + 1) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(x + 1) equal to 4.898979486 and -4.898979486.

Subproblem 1

x + 1 = 4.898979486 Simplifying x + 1 = 4.898979486 Reorder the terms: 1 + x = 4.898979486 Solving 1 + x = 4.898979486 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 = 4.898979486 + -1 Combine like terms: 1 + -1 = 0 0 + x = 4.898979486 + -1 x = 4.898979486 + -1 Combine like terms: 4.898979486 + -1 = 3.898979486 x = 3.898979486 Simplifying x = 3.898979486

Subproblem 2

x + 1 = -4.898979486 Simplifying x + 1 = -4.898979486 Reorder the terms: 1 + x = -4.898979486 Solving 1 + x = -4.898979486 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 = -4.898979486 + -1 Combine like terms: 1 + -1 = 0 0 + x = -4.898979486 + -1 x = -4.898979486 + -1 Combine like terms: -4.898979486 + -1 = -5.898979486 x = -5.898979486 Simplifying x = -5.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.898979486, -5.898979486}

See similar equations:

| b^2-2b+3b-6= | | 3.8x=2.8x+7.0 | | -48=-5x+8-x | | 1.5y+6=y | | 3.8=0.5(8x-4.6) | | 10h^3n^3-2hn^2+14hn= | | -38=-2(-43x-24) | | 2y+5=4 | | 3p^2r^2+6pr+p= | | v^2=4v-5 | | a^2b^2+a= | | 14.2=0.4(20x-7.8) | | x^3-9x^2+11x+21=0 | | 33=-3(23-z)+3(z-4) | | 4w+6=0 | | 12x-215=3x-8 | | y-2=-5 | | 25(y+4)=5(2y+5) | | 81r+48rt= | | -2=4+w | | 123-4x=14x+21 | | A+17=35 | | 12x-3=65-5x | | 10q-25q^2= | | 7x+2=4x | | x+(x-5)+(x+7)=83 | | 1/5+1/7+1/12+1/5=x | | 2x+4x-8=2(x+3)+4x | | 8m-6= | | z-3=-7 | | x^2+2x-35=9 | | 1/5+1/7+1/12+5=x |

Equations solver categories