x(10x+2)=7

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Solution for x(10x+2)=7 equation:


Simplifying
x(10x + 2) = 7

Reorder the terms:
x(2 + 10x) = 7
(2 * x + 10x * x) = 7
(2x + 10x2) = 7

Solving
2x + 10x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 2x + 10x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 2x + 10x2 = 0

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

Divide each side by '10'.
-0.7 + 0.2x + x2 = 0

Move the constant term to the right:

Add '0.7' to each side of the equation.
-0.7 + 0.2x + 0.7 + x2 = 0 + 0.7

Reorder the terms:
-0.7 + 0.7 + 0.2x + x2 = 0 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + 0.2x + x2 = 0 + 0.7
0.2x + x2 = 0 + 0.7

Combine like terms: 0 + 0.7 = 0.7
0.2x + x2 = 0.7

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 0.7 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 0.7 + 0.01

Combine like terms: 0.7 + 0.01 = 0.71
0.01 + 0.2x + x2 = 0.71

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 0.71

Calculate the square root of the right side: 0.842614977

Break this problem into two subproblems by setting 
(x + 0.1) equal to 0.842614977 and -0.842614977.

Subproblem 1

x + 0.1 = 0.842614977 Simplifying x + 0.1 = 0.842614977 Reorder the terms: 0.1 + x = 0.842614977 Solving 0.1 + x = 0.842614977 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 0.842614977 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 0.842614977 + -0.1 x = 0.842614977 + -0.1 Combine like terms: 0.842614977 + -0.1 = 0.742614977 x = 0.742614977 Simplifying x = 0.742614977

Subproblem 2

x + 0.1 = -0.842614977 Simplifying x + 0.1 = -0.842614977 Reorder the terms: 0.1 + x = -0.842614977 Solving 0.1 + x = -0.842614977 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -0.842614977 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -0.842614977 + -0.1 x = -0.842614977 + -0.1 Combine like terms: -0.842614977 + -0.1 = -0.942614977 x = -0.942614977 Simplifying x = -0.942614977

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.742614977, -0.942614977}

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