x^2=42+2x

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Solution for x^2=42+2x equation:


Simplifying
x2 = 42 + 2x

Solving
x2 = 42 + 2x

Solving for variable 'x'.

Reorder the terms:
-42 + -2x + x2 = 42 + 2x + -42 + -2x

Reorder the terms:
-42 + -2x + x2 = 42 + -42 + 2x + -2x

Combine like terms: 42 + -42 = 0
-42 + -2x + x2 = 0 + 2x + -2x
-42 + -2x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-42 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '42' to each side of the equation.
-42 + -2x + 42 + x2 = 0 + 42

Reorder the terms:
-42 + 42 + -2x + x2 = 0 + 42

Combine like terms: -42 + 42 = 0
0 + -2x + x2 = 0 + 42
-2x + x2 = 0 + 42

Combine like terms: 0 + 42 = 42
-2x + x2 = 42

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 = 42 + 1

Reorder the terms:
1 + -2x + x2 = 42 + 1

Combine like terms: 42 + 1 = 43
1 + -2x + x2 = 43

Factor a perfect square on the left side:
(x + -1)(x + -1) = 43

Calculate the square root of the right side: 6.557438524

Break this problem into two subproblems by setting 
(x + -1) equal to 6.557438524 and -6.557438524.

Subproblem 1

x + -1 = 6.557438524 Simplifying x + -1 = 6.557438524 Reorder the terms: -1 + x = 6.557438524 Solving -1 + x = 6.557438524 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 = 6.557438524 + 1 Combine like terms: -1 + 1 = 0 0 + x = 6.557438524 + 1 x = 6.557438524 + 1 Combine like terms: 6.557438524 + 1 = 7.557438524 x = 7.557438524 Simplifying x = 7.557438524

Subproblem 2

x + -1 = -6.557438524 Simplifying x + -1 = -6.557438524 Reorder the terms: -1 + x = -6.557438524 Solving -1 + x = -6.557438524 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 = -6.557438524 + 1 Combine like terms: -1 + 1 = 0 0 + x = -6.557438524 + 1 x = -6.557438524 + 1 Combine like terms: -6.557438524 + 1 = -5.557438524 x = -5.557438524 Simplifying x = -5.557438524

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.557438524, -5.557438524}

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