1+9x(x-8)=10x(5+x)

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Solution for 1+9x(x-8)=10x(5+x) equation:


Simplifying
1 + 9x(x + -8) = 10x(5 + x)

Reorder the terms:
1 + 9x(-8 + x) = 10x(5 + x)
1 + (-8 * 9x + x * 9x) = 10x(5 + x)
1 + (-72x + 9x2) = 10x(5 + x)
1 + -72x + 9x2 = (5 * 10x + x * 10x)
1 + -72x + 9x2 = (50x + 10x2)

Solving
1 + -72x + 9x2 = 50x + 10x2

Solving for variable 'x'.

Reorder the terms:
1 + -72x + -50x + 9x2 + -10x2 = 50x + 10x2 + -50x + -10x2

Combine like terms: -72x + -50x = -122x
1 + -122x + 9x2 + -10x2 = 50x + 10x2 + -50x + -10x2

Combine like terms: 9x2 + -10x2 = -1x2
1 + -122x + -1x2 = 50x + 10x2 + -50x + -10x2

Reorder the terms:
1 + -122x + -1x2 = 50x + -50x + 10x2 + -10x2

Combine like terms: 50x + -50x = 0
1 + -122x + -1x2 = 0 + 10x2 + -10x2
1 + -122x + -1x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
1 + -122x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1 + 122x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 122x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 122x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 122x + x2 = 0 + 1
122x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
122x + x2 = 1

The x term is 122x.  Take half its coefficient (61).
Square it (3721) and add it to both sides.

Add '3721' to each side of the equation.
122x + 3721 + x2 = 1 + 3721

Reorder the terms:
3721 + 122x + x2 = 1 + 3721

Combine like terms: 1 + 3721 = 3722
3721 + 122x + x2 = 3722

Factor a perfect square on the left side:
(x + 61)(x + 61) = 3722

Calculate the square root of the right side: 61.008196171

Break this problem into two subproblems by setting 
(x + 61) equal to 61.008196171 and -61.008196171.

Subproblem 1

x + 61 = 61.008196171 Simplifying x + 61 = 61.008196171 Reorder the terms: 61 + x = 61.008196171 Solving 61 + x = 61.008196171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-61' to each side of the equation. 61 + -61 + x = 61.008196171 + -61 Combine like terms: 61 + -61 = 0 0 + x = 61.008196171 + -61 x = 61.008196171 + -61 Combine like terms: 61.008196171 + -61 = 0.008196171 x = 0.008196171 Simplifying x = 0.008196171

Subproblem 2

x + 61 = -61.008196171 Simplifying x + 61 = -61.008196171 Reorder the terms: 61 + x = -61.008196171 Solving 61 + x = -61.008196171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-61' to each side of the equation. 61 + -61 + x = -61.008196171 + -61 Combine like terms: 61 + -61 = 0 0 + x = -61.008196171 + -61 x = -61.008196171 + -61 Combine like terms: -61.008196171 + -61 = -122.008196171 x = -122.008196171 Simplifying x = -122.008196171

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.008196171, -122.008196171}

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