x(x+4)=196

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Solution for x(x+4)=196 equation:


Simplifying
x(x + 4) = 196

Reorder the terms:
x(4 + x) = 196
(4 * x + x * x) = 196
(4x + x2) = 196

Solving
4x + x2 = 196

Solving for variable 'x'.

Reorder the terms:
-196 + 4x + x2 = 196 + -196

Combine like terms: 196 + -196 = 0
-196 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '196' to each side of the equation.
-196 + 4x + 196 + x2 = 0 + 196

Reorder the terms:
-196 + 196 + 4x + x2 = 0 + 196

Combine like terms: -196 + 196 = 0
0 + 4x + x2 = 0 + 196
4x + x2 = 0 + 196

Combine like terms: 0 + 196 = 196
4x + x2 = 196

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 = 196 + 4

Reorder the terms:
4 + 4x + x2 = 196 + 4

Combine like terms: 196 + 4 = 200
4 + 4x + x2 = 200

Factor a perfect square on the left side:
(x + 2)(x + 2) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(x + 2) equal to 14.142135624 and -14.142135624.

Subproblem 1

x + 2 = 14.142135624 Simplifying x + 2 = 14.142135624 Reorder the terms: 2 + x = 14.142135624 Solving 2 + x = 14.142135624 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 = 14.142135624 + -2 Combine like terms: 2 + -2 = 0 0 + x = 14.142135624 + -2 x = 14.142135624 + -2 Combine like terms: 14.142135624 + -2 = 12.142135624 x = 12.142135624 Simplifying x = 12.142135624

Subproblem 2

x + 2 = -14.142135624 Simplifying x + 2 = -14.142135624 Reorder the terms: 2 + x = -14.142135624 Solving 2 + x = -14.142135624 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 = -14.142135624 + -2 Combine like terms: 2 + -2 = 0 0 + x = -14.142135624 + -2 x = -14.142135624 + -2 Combine like terms: -14.142135624 + -2 = -16.142135624 x = -16.142135624 Simplifying x = -16.142135624

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.142135624, -16.142135624}

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