0.10x+0.25x(x+10)+0.05(4)(x+10)=6.15

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Solution for 0.10x+0.25x(x+10)+0.05(4)(x+10)=6.15 equation:


Simplifying
0.10x + 0.25x(x + 10) + 0.05(4)(x + 10) = 6.15

Reorder the terms:
0.10x + 0.25x(10 + x) + 0.05(4)(x + 10) = 6.15
0.10x + (10 * 0.25x + x * 0.25x) + 0.05(4)(x + 10) = 6.15
0.10x + (2.5x + 0.25x2) + 0.05(4)(x + 10) = 6.15

Reorder the terms:
0.10x + 2.5x + 0.25x2 + 0.05 * 4(10 + x) = 6.15

Multiply 0.05 * 4
0.10x + 2.5x + 0.25x2 + 0.2(10 + x) = 6.15
0.10x + 2.5x + 0.25x2 + (10 * 0.2 + x * 0.2) = 6.15
0.10x + 2.5x + 0.25x2 + (2 + 0.2x) = 6.15

Reorder the terms:
2 + 0.10x + 2.5x + 0.2x + 0.25x2 = 6.15

Combine like terms: 0.10x + 2.5x = 2.6x
2 + 2.6x + 0.2x + 0.25x2 = 6.15

Combine like terms: 2.6x + 0.2x = 2.8x
2 + 2.8x + 0.25x2 = 6.15

Solving
2 + 2.8x + 0.25x2 = 6.15

Solving for variable 'x'.

Reorder the terms:
2 + -6.15 + 2.8x + 0.25x2 = 6.15 + -6.15

Combine like terms: 2 + -6.15 = -4.15
-4.15 + 2.8x + 0.25x2 = 6.15 + -6.15

Combine like terms: 6.15 + -6.15 = 0.00
-4.15 + 2.8x + 0.25x2 = 0.00

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

Divide each side by '0.25'.
-16.6 + 11.2x + x2 = 0

Move the constant term to the right:

Add '16.6' to each side of the equation.
-16.6 + 11.2x + 16.6 + x2 = 0 + 16.6

Reorder the terms:
-16.6 + 16.6 + 11.2x + x2 = 0 + 16.6

Combine like terms: -16.6 + 16.6 = 0.0
0.0 + 11.2x + x2 = 0 + 16.6
11.2x + x2 = 0 + 16.6

Combine like terms: 0 + 16.6 = 16.6
11.2x + x2 = 16.6

The x term is 11.2x.  Take half its coefficient (5.6).
Square it (31.36) and add it to both sides.

Add '31.36' to each side of the equation.
11.2x + 31.36 + x2 = 16.6 + 31.36

Reorder the terms:
31.36 + 11.2x + x2 = 16.6 + 31.36

Combine like terms: 16.6 + 31.36 = 47.96
31.36 + 11.2x + x2 = 47.96

Factor a perfect square on the left side:
(x + 5.6)(x + 5.6) = 47.96

Calculate the square root of the right side: 6.925315877

Break this problem into two subproblems by setting 
(x + 5.6) equal to 6.925315877 and -6.925315877.

Subproblem 1

x + 5.6 = 6.925315877 Simplifying x + 5.6 = 6.925315877 Reorder the terms: 5.6 + x = 6.925315877 Solving 5.6 + x = 6.925315877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.6' to each side of the equation. 5.6 + -5.6 + x = 6.925315877 + -5.6 Combine like terms: 5.6 + -5.6 = 0.0 0.0 + x = 6.925315877 + -5.6 x = 6.925315877 + -5.6 Combine like terms: 6.925315877 + -5.6 = 1.325315877 x = 1.325315877 Simplifying x = 1.325315877

Subproblem 2

x + 5.6 = -6.925315877 Simplifying x + 5.6 = -6.925315877 Reorder the terms: 5.6 + x = -6.925315877 Solving 5.6 + x = -6.925315877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.6' to each side of the equation. 5.6 + -5.6 + x = -6.925315877 + -5.6 Combine like terms: 5.6 + -5.6 = 0.0 0.0 + x = -6.925315877 + -5.6 x = -6.925315877 + -5.6 Combine like terms: -6.925315877 + -5.6 = -12.525315877 x = -12.525315877 Simplifying x = -12.525315877

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.325315877, -12.525315877}

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