5x(2x+7)=2

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Solution for 5x(2x+7)=2 equation:


Simplifying
5x(2x + 7) = 2

Reorder the terms:
5x(7 + 2x) = 2
(7 * 5x + 2x * 5x) = 2
(35x + 10x2) = 2

Solving
35x + 10x2 = 2

Solving for variable 'x'.

Reorder the terms:
-2 + 35x + 10x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + 35x + 10x2 = 0

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

Divide each side by '10'.
-0.2 + 3.5x + x2 = 0.0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 3.5x + 0.2 + x2 = 0.0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 3.5x + x2 = 0.0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 3.5x + x2 = 0.0 + 0.2
3.5x + x2 = 0.0 + 0.2

Combine like terms: 0.0 + 0.2 = 0.2
3.5x + x2 = 0.2

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 0.2 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 0.2 + 3.0625

Combine like terms: 0.2 + 3.0625 = 3.2625
3.0625 + 3.5x + x2 = 3.2625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 3.2625

Calculate the square root of the right side: 1.806239187

Break this problem into two subproblems by setting 
(x + 1.75) equal to 1.806239187 and -1.806239187.

Subproblem 1

x + 1.75 = 1.806239187 Simplifying x + 1.75 = 1.806239187 Reorder the terms: 1.75 + x = 1.806239187 Solving 1.75 + x = 1.806239187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 1.806239187 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 1.806239187 + -1.75 x = 1.806239187 + -1.75 Combine like terms: 1.806239187 + -1.75 = 0.056239187 x = 0.056239187 Simplifying x = 0.056239187

Subproblem 2

x + 1.75 = -1.806239187 Simplifying x + 1.75 = -1.806239187 Reorder the terms: 1.75 + x = -1.806239187 Solving 1.75 + x = -1.806239187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -1.806239187 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -1.806239187 + -1.75 x = -1.806239187 + -1.75 Combine like terms: -1.806239187 + -1.75 = -3.556239187 x = -3.556239187 Simplifying x = -3.556239187

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.056239187, -3.556239187}

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