x^2+4x=100

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Solution for x^2+4x=100 equation:


Simplifying
x2 + 4x = 100

Reorder the terms:
4x + x2 = 100

Solving
4x + x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + 4x + x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 4x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 4x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 4x + x2 = 0 + 100
4x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
4x + x2 = 100

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 = 100 + 4

Reorder the terms:
4 + 4x + x2 = 100 + 4

Combine like terms: 100 + 4 = 104
4 + 4x + x2 = 104

Factor a perfect square on the left side:
(x + 2)(x + 2) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(x + 2) equal to 10.198039027 and -10.198039027.

Subproblem 1

x + 2 = 10.198039027 Simplifying x + 2 = 10.198039027 Reorder the terms: 2 + x = 10.198039027 Solving 2 + x = 10.198039027 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 = 10.198039027 + -2 Combine like terms: 2 + -2 = 0 0 + x = 10.198039027 + -2 x = 10.198039027 + -2 Combine like terms: 10.198039027 + -2 = 8.198039027 x = 8.198039027 Simplifying x = 8.198039027

Subproblem 2

x + 2 = -10.198039027 Simplifying x + 2 = -10.198039027 Reorder the terms: 2 + x = -10.198039027 Solving 2 + x = -10.198039027 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 = -10.198039027 + -2 Combine like terms: 2 + -2 = 0 0 + x = -10.198039027 + -2 x = -10.198039027 + -2 Combine like terms: -10.198039027 + -2 = -12.198039027 x = -12.198039027 Simplifying x = -12.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.198039027, -12.198039027}

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