1x+3x(5x)=15

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Solution for 1x+3x(5x)=15 equation:


Simplifying
1x + 3x(5x) = 15

Remove parenthesis around (5x)
1x + 3x * 5x = 15

Reorder the terms for easier multiplication:
1x + 3 * 5x * x = 15

Multiply 3 * 5
1x + 15x * x = 15

Multiply x * x
1x + 15x2 = 15

Solving
1x + 15x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + 1x + 15x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 1x + 15x2 = 0

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

Divide each side by '15'.
-1 + 0.06666666667x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 0.06666666667x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 0.06666666667x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.06666666667x + x2 = 0 + 1
0.06666666667x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
0.06666666667x + x2 = 1

The x term is 0.06666666667x.  Take half its coefficient (0.03333333334).
Square it (0.001111111112) and add it to both sides.

Add '0.001111111112' to each side of the equation.
0.06666666667x + 0.001111111112 + x2 = 1 + 0.001111111112

Reorder the terms:
0.001111111112 + 0.06666666667x + x2 = 1 + 0.001111111112

Combine like terms: 1 + 0.001111111112 = 1.001111111112
0.001111111112 + 0.06666666667x + x2 = 1.001111111112

Factor a perfect square on the left side:
(x + 0.03333333334)(x + 0.03333333334) = 1.001111111112

Calculate the square root of the right side: 1.000555401

Break this problem into two subproblems by setting 
(x + 0.03333333334) equal to 1.000555401 and -1.000555401.

Subproblem 1

x + 0.03333333334 = 1.000555401 Simplifying x + 0.03333333334 = 1.000555401 Reorder the terms: 0.03333333334 + x = 1.000555401 Solving 0.03333333334 + x = 1.000555401 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.03333333334' to each side of the equation. 0.03333333334 + -0.03333333334 + x = 1.000555401 + -0.03333333334 Combine like terms: 0.03333333334 + -0.03333333334 = 0.00000000000 0.00000000000 + x = 1.000555401 + -0.03333333334 x = 1.000555401 + -0.03333333334 Combine like terms: 1.000555401 + -0.03333333334 = 0.96722206766 x = 0.96722206766 Simplifying x = 0.96722206766

Subproblem 2

x + 0.03333333334 = -1.000555401 Simplifying x + 0.03333333334 = -1.000555401 Reorder the terms: 0.03333333334 + x = -1.000555401 Solving 0.03333333334 + x = -1.000555401 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.03333333334' to each side of the equation. 0.03333333334 + -0.03333333334 + x = -1.000555401 + -0.03333333334 Combine like terms: 0.03333333334 + -0.03333333334 = 0.00000000000 0.00000000000 + x = -1.000555401 + -0.03333333334 x = -1.000555401 + -0.03333333334 Combine like terms: -1.000555401 + -0.03333333334 = -1.03388873434 x = -1.03388873434 Simplifying x = -1.03388873434

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.96722206766, -1.03388873434}

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