5x(3x+5)=13

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Solution for 5x(3x+5)=13 equation:


Simplifying
5x(3x + 5) = 13

Reorder the terms:
5x(5 + 3x) = 13
(5 * 5x + 3x * 5x) = 13
(25x + 15x2) = 13

Solving
25x + 15x2 = 13

Solving for variable 'x'.

Reorder the terms:
-13 + 25x + 15x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + 25x + 15x2 = 0

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

Divide each side by '15'.
-0.8666666667 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '0.8666666667' to each side of the equation.
-0.8666666667 + 1.666666667x + 0.8666666667 + x2 = 0 + 0.8666666667

Reorder the terms:
-0.8666666667 + 0.8666666667 + 1.666666667x + x2 = 0 + 0.8666666667

Combine like terms: -0.8666666667 + 0.8666666667 = 0.0000000000
0.0000000000 + 1.666666667x + x2 = 0 + 0.8666666667
1.666666667x + x2 = 0 + 0.8666666667

Combine like terms: 0 + 0.8666666667 = 0.8666666667
1.666666667x + x2 = 0.8666666667

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 0.8666666667 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 0.8666666667 + 0.6944444447

Combine like terms: 0.8666666667 + 0.6944444447 = 1.5611111114
0.6944444447 + 1.666666667x + x2 = 1.5611111114

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 1.5611111114

Calculate the square root of the right side: 1.249444321

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 1.249444321 and -1.249444321.

Subproblem 1

x + 0.8333333335 = 1.249444321 Simplifying x + 0.8333333335 = 1.249444321 Reorder the terms: 0.8333333335 + x = 1.249444321 Solving 0.8333333335 + x = 1.249444321 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = 1.249444321 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = 1.249444321 + -0.8333333335 x = 1.249444321 + -0.8333333335 Combine like terms: 1.249444321 + -0.8333333335 = 0.4161109875 x = 0.4161109875 Simplifying x = 0.4161109875

Subproblem 2

x + 0.8333333335 = -1.249444321 Simplifying x + 0.8333333335 = -1.249444321 Reorder the terms: 0.8333333335 + x = -1.249444321 Solving 0.8333333335 + x = -1.249444321 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = -1.249444321 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = -1.249444321 + -0.8333333335 x = -1.249444321 + -0.8333333335 Combine like terms: -1.249444321 + -0.8333333335 = -2.0827776545 x = -2.0827776545 Simplifying x = -2.0827776545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4161109875, -2.0827776545}

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