x+2x(2x+5)=100

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Solution for x+2x(2x+5)=100 equation:


Simplifying
x + 2x(2x + 5) = 100

Reorder the terms:
x + 2x(5 + 2x) = 100
x + (5 * 2x + 2x * 2x) = 100
x + (10x + 4x2) = 100

Combine like terms: x + 10x = 11x
11x + 4x2 = 100

Solving
11x + 4x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + 11x + 4x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 11x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-25 + 2.75x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 2.75x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 2.75x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 2.75x + x2 = 0 + 25
2.75x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
2.75x + x2 = 25

The x term is 2.75x.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75x + 1.890625 + x2 = 25 + 1.890625

Reorder the terms:
1.890625 + 2.75x + x2 = 25 + 1.890625

Combine like terms: 25 + 1.890625 = 26.890625
1.890625 + 2.75x + x2 = 26.890625

Factor a perfect square on the left side:
(x + 1.375)(x + 1.375) = 26.890625

Calculate the square root of the right side: 5.185617128

Break this problem into two subproblems by setting 
(x + 1.375) equal to 5.185617128 and -5.185617128.

Subproblem 1

x + 1.375 = 5.185617128 Simplifying x + 1.375 = 5.185617128 Reorder the terms: 1.375 + x = 5.185617128 Solving 1.375 + x = 5.185617128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = 5.185617128 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 5.185617128 + -1.375 x = 5.185617128 + -1.375 Combine like terms: 5.185617128 + -1.375 = 3.810617128 x = 3.810617128 Simplifying x = 3.810617128

Subproblem 2

x + 1.375 = -5.185617128 Simplifying x + 1.375 = -5.185617128 Reorder the terms: 1.375 + x = -5.185617128 Solving 1.375 + x = -5.185617128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = -5.185617128 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -5.185617128 + -1.375 x = -5.185617128 + -1.375 Combine like terms: -5.185617128 + -1.375 = -6.560617128 x = -6.560617128 Simplifying x = -6.560617128

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.810617128, -6.560617128}

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