x^2+4x=43

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Solution for x^2+4x=43 equation:


Simplifying
x2 + 4x = 43

Reorder the terms:
4x + x2 = 43

Solving
4x + x2 = 43

Solving for variable 'x'.

Reorder the terms:
-43 + 4x + x2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + 4x + 43 + x2 = 0 + 43

Reorder the terms:
-43 + 43 + 4x + x2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + 4x + x2 = 0 + 43
4x + x2 = 0 + 43

Combine like terms: 0 + 43 = 43
4x + x2 = 43

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 = 43 + 4

Reorder the terms:
4 + 4x + x2 = 43 + 4

Combine like terms: 43 + 4 = 47
4 + 4x + x2 = 47

Factor a perfect square on the left side:
(x + 2)(x + 2) = 47

Calculate the square root of the right side: 6.8556546

Break this problem into two subproblems by setting 
(x + 2) equal to 6.8556546 and -6.8556546.

Subproblem 1

x + 2 = 6.8556546 Simplifying x + 2 = 6.8556546 Reorder the terms: 2 + x = 6.8556546 Solving 2 + x = 6.8556546 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 = 6.8556546 + -2 Combine like terms: 2 + -2 = 0 0 + x = 6.8556546 + -2 x = 6.8556546 + -2 Combine like terms: 6.8556546 + -2 = 4.8556546 x = 4.8556546 Simplifying x = 4.8556546

Subproblem 2

x + 2 = -6.8556546 Simplifying x + 2 = -6.8556546 Reorder the terms: 2 + x = -6.8556546 Solving 2 + x = -6.8556546 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 = -6.8556546 + -2 Combine like terms: 2 + -2 = 0 0 + x = -6.8556546 + -2 x = -6.8556546 + -2 Combine like terms: -6.8556546 + -2 = -8.8556546 x = -8.8556546 Simplifying x = -8.8556546

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.8556546, -8.8556546}

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