x(0.25x)=x+15

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Solution for x(0.25x)=x+15 equation:


Simplifying
x(0.25x) = x + 15

Remove parenthesis around (0.25x)
x * 0.25x = x + 15

Reorder the terms for easier multiplication:
0.25x * x = x + 15

Multiply x * x
0.25x2 = x + 15

Reorder the terms:
0.25x2 = 15 + x

Solving
0.25x2 = 15 + x

Solving for variable 'x'.

Reorder the terms:
-15 + -1x + 0.25x2 = 15 + x + -15 + -1x

Reorder the terms:
-15 + -1x + 0.25x2 = 15 + -15 + x + -1x

Combine like terms: 15 + -15 = 0
-15 + -1x + 0.25x2 = 0 + x + -1x
-15 + -1x + 0.25x2 = x + -1x

Combine like terms: x + -1x = 0
-15 + -1x + 0.25x2 = 0

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

Divide each side by '0.25'.
-60 + -4x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + -4x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + -4x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + -4x + x2 = 0 + 60
-4x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
-4x + x2 = 60

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 60 + 4

Reorder the terms:
4 + -4x + x2 = 60 + 4

Combine like terms: 60 + 4 = 64
4 + -4x + x2 = 64

Factor a perfect square on the left side:
(x + -2)(x + -2) = 64

Calculate the square root of the right side: 8

Break this problem into two subproblems by setting 
(x + -2) equal to 8 and -8.

Subproblem 1

x + -2 = 8 Simplifying x + -2 = 8 Reorder the terms: -2 + x = 8 Solving -2 + x = 8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 8 + 2 Combine like terms: -2 + 2 = 0 0 + x = 8 + 2 x = 8 + 2 Combine like terms: 8 + 2 = 10 x = 10 Simplifying x = 10

Subproblem 2

x + -2 = -8 Simplifying x + -2 = -8 Reorder the terms: -2 + x = -8 Solving -2 + x = -8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -8 + 2 Combine like terms: -2 + 2 = 0 0 + x = -8 + 2 x = -8 + 2 Combine like terms: -8 + 2 = -6 x = -6 Simplifying x = -6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10, -6}

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