x+2x(x+10)=146

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Solution for x+2x(x+10)=146 equation:


Simplifying
x + 2x(x + 10) = 146

Reorder the terms:
x + 2x(10 + x) = 146
x + (10 * 2x + x * 2x) = 146
x + (20x + 2x2) = 146

Combine like terms: x + 20x = 21x
21x + 2x2 = 146

Solving
21x + 2x2 = 146

Solving for variable 'x'.

Reorder the terms:
-146 + 21x + 2x2 = 146 + -146

Combine like terms: 146 + -146 = 0
-146 + 21x + 2x2 = 0

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

Divide each side by '2'.
-73 + 10.5x + x2 = 0

Move the constant term to the right:

Add '73' to each side of the equation.
-73 + 10.5x + 73 + x2 = 0 + 73

Reorder the terms:
-73 + 73 + 10.5x + x2 = 0 + 73

Combine like terms: -73 + 73 = 0
0 + 10.5x + x2 = 0 + 73
10.5x + x2 = 0 + 73

Combine like terms: 0 + 73 = 73
10.5x + x2 = 73

The x term is 10.5x.  Take half its coefficient (5.25).
Square it (27.5625) and add it to both sides.

Add '27.5625' to each side of the equation.
10.5x + 27.5625 + x2 = 73 + 27.5625

Reorder the terms:
27.5625 + 10.5x + x2 = 73 + 27.5625

Combine like terms: 73 + 27.5625 = 100.5625
27.5625 + 10.5x + x2 = 100.5625

Factor a perfect square on the left side:
(x + 5.25)(x + 5.25) = 100.5625

Calculate the square root of the right side: 10.02808556

Break this problem into two subproblems by setting 
(x + 5.25) equal to 10.02808556 and -10.02808556.

Subproblem 1

x + 5.25 = 10.02808556 Simplifying x + 5.25 = 10.02808556 Reorder the terms: 5.25 + x = 10.02808556 Solving 5.25 + x = 10.02808556 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = 10.02808556 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = 10.02808556 + -5.25 x = 10.02808556 + -5.25 Combine like terms: 10.02808556 + -5.25 = 4.77808556 x = 4.77808556 Simplifying x = 4.77808556

Subproblem 2

x + 5.25 = -10.02808556 Simplifying x + 5.25 = -10.02808556 Reorder the terms: 5.25 + x = -10.02808556 Solving 5.25 + x = -10.02808556 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = -10.02808556 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = -10.02808556 + -5.25 x = -10.02808556 + -5.25 Combine like terms: -10.02808556 + -5.25 = -15.27808556 x = -15.27808556 Simplifying x = -15.27808556

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.77808556, -15.27808556}

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