5x(2x+.02)=67

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Solution for 5x(2x+.02)=67 equation:


Simplifying
5x(2x + 0.02) = 67

Reorder the terms:
5x(0.02 + 2x) = 67
(0.02 * 5x + 2x * 5x) = 67
(0.1x + 10x2) = 67

Solving
0.1x + 10x2 = 67

Solving for variable 'x'.

Reorder the terms:
-67 + 0.1x + 10x2 = 67 + -67

Combine like terms: 67 + -67 = 0
-67 + 0.1x + 10x2 = 0

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

Divide each side by '10'.
-6.7 + 0.01x + x2 = 0.0

Move the constant term to the right:

Add '6.7' to each side of the equation.
-6.7 + 0.01x + 6.7 + x2 = 0.0 + 6.7

Reorder the terms:
-6.7 + 6.7 + 0.01x + x2 = 0.0 + 6.7

Combine like terms: -6.7 + 6.7 = 0.0
0.0 + 0.01x + x2 = 0.0 + 6.7
0.01x + x2 = 0.0 + 6.7

Combine like terms: 0.0 + 6.7 = 6.7
0.01x + x2 = 6.7

The x term is 0.01x.  Take half its coefficient (0.005).
Square it (0.000025) and add it to both sides.

Add '0.000025' to each side of the equation.
0.01x + 0.000025 + x2 = 6.7 + 0.000025

Reorder the terms:
0.000025 + 0.01x + x2 = 6.7 + 0.000025

Combine like terms: 6.7 + 0.000025 = 6.700025
0.000025 + 0.01x + x2 = 6.700025

Factor a perfect square on the left side:
(x + 0.005)(x + 0.005) = 6.700025

Calculate the square root of the right side: 2.58844065

Break this problem into two subproblems by setting 
(x + 0.005) equal to 2.58844065 and -2.58844065.

Subproblem 1

x + 0.005 = 2.58844065 Simplifying x + 0.005 = 2.58844065 Reorder the terms: 0.005 + x = 2.58844065 Solving 0.005 + x = 2.58844065 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.005' to each side of the equation. 0.005 + -0.005 + x = 2.58844065 + -0.005 Combine like terms: 0.005 + -0.005 = 0.000 0.000 + x = 2.58844065 + -0.005 x = 2.58844065 + -0.005 Combine like terms: 2.58844065 + -0.005 = 2.58344065 x = 2.58344065 Simplifying x = 2.58344065

Subproblem 2

x + 0.005 = -2.58844065 Simplifying x + 0.005 = -2.58844065 Reorder the terms: 0.005 + x = -2.58844065 Solving 0.005 + x = -2.58844065 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.005' to each side of the equation. 0.005 + -0.005 + x = -2.58844065 + -0.005 Combine like terms: 0.005 + -0.005 = 0.000 0.000 + x = -2.58844065 + -0.005 x = -2.58844065 + -0.005 Combine like terms: -2.58844065 + -0.005 = -2.59344065 x = -2.59344065 Simplifying x = -2.59344065

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.58344065, -2.59344065}

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