5x(5x+3)=19

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Solution for 5x(5x+3)=19 equation:


Simplifying
5x(5x + 3) = 19

Reorder the terms:
5x(3 + 5x) = 19
(3 * 5x + 5x * 5x) = 19
(15x + 25x2) = 19

Solving
15x + 25x2 = 19

Solving for variable 'x'.

Reorder the terms:
-19 + 15x + 25x2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + 15x + 25x2 = 0

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

Divide each side by '25'.
-0.76 + 0.6x + x2 = 0

Move the constant term to the right:

Add '0.76' to each side of the equation.
-0.76 + 0.6x + 0.76 + x2 = 0 + 0.76

Reorder the terms:
-0.76 + 0.76 + 0.6x + x2 = 0 + 0.76

Combine like terms: -0.76 + 0.76 = 0.00
0.00 + 0.6x + x2 = 0 + 0.76
0.6x + x2 = 0 + 0.76

Combine like terms: 0 + 0.76 = 0.76
0.6x + x2 = 0.76

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 0.76 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 0.76 + 0.09

Combine like terms: 0.76 + 0.09 = 0.85
0.09 + 0.6x + x2 = 0.85

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 0.85

Calculate the square root of the right side: 0.921954446

Break this problem into two subproblems by setting 
(x + 0.3) equal to 0.921954446 and -0.921954446.

Subproblem 1

x + 0.3 = 0.921954446 Simplifying x + 0.3 = 0.921954446 Reorder the terms: 0.3 + x = 0.921954446 Solving 0.3 + x = 0.921954446 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 0.921954446 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 0.921954446 + -0.3 x = 0.921954446 + -0.3 Combine like terms: 0.921954446 + -0.3 = 0.621954446 x = 0.621954446 Simplifying x = 0.621954446

Subproblem 2

x + 0.3 = -0.921954446 Simplifying x + 0.3 = -0.921954446 Reorder the terms: 0.3 + x = -0.921954446 Solving 0.3 + x = -0.921954446 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -0.921954446 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -0.921954446 + -0.3 x = -0.921954446 + -0.3 Combine like terms: -0.921954446 + -0.3 = -1.221954446 x = -1.221954446 Simplifying x = -1.221954446

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.621954446, -1.221954446}

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