(3x+5)*2x=25

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Solution for (3x+5)*2x=25 equation:


Simplifying
(3x + 5) * 2x = 25

Reorder the terms:
(5 + 3x) * 2x = 25

Reorder the terms for easier multiplication:
2x(5 + 3x) = 25
(5 * 2x + 3x * 2x) = 25
(10x + 6x2) = 25

Solving
10x + 6x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + 10x + 6x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 10x + 6x2 = 0

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

Divide each side by '6'.
-4.166666667 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '4.166666667' to each side of the equation.
-4.166666667 + 1.666666667x + 4.166666667 + x2 = 0 + 4.166666667

Reorder the terms:
-4.166666667 + 4.166666667 + 1.666666667x + x2 = 0 + 4.166666667

Combine like terms: -4.166666667 + 4.166666667 = 0.000000000
0.000000000 + 1.666666667x + x2 = 0 + 4.166666667
1.666666667x + x2 = 0 + 4.166666667

Combine like terms: 0 + 4.166666667 = 4.166666667
1.666666667x + x2 = 4.166666667

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 = 4.166666667 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 4.166666667 + 0.6944444447

Combine like terms: 4.166666667 + 0.6944444447 = 4.8611111117
0.6944444447 + 1.666666667x + x2 = 4.8611111117

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 4.8611111117

Calculate the square root of the right side: 2.204792759

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 2.204792759 and -2.204792759.

Subproblem 1

x + 0.8333333335 = 2.204792759 Simplifying x + 0.8333333335 = 2.204792759 Reorder the terms: 0.8333333335 + x = 2.204792759 Solving 0.8333333335 + x = 2.204792759 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 = 2.204792759 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = 2.204792759 + -0.8333333335 x = 2.204792759 + -0.8333333335 Combine like terms: 2.204792759 + -0.8333333335 = 1.3714594255 x = 1.3714594255 Simplifying x = 1.3714594255

Subproblem 2

x + 0.8333333335 = -2.204792759 Simplifying x + 0.8333333335 = -2.204792759 Reorder the terms: 0.8333333335 + x = -2.204792759 Solving 0.8333333335 + x = -2.204792759 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 = -2.204792759 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = -2.204792759 + -0.8333333335 x = -2.204792759 + -0.8333333335 Combine like terms: -2.204792759 + -0.8333333335 = -3.0381260925 x = -3.0381260925 Simplifying x = -3.0381260925

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.3714594255, -3.0381260925}

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