(x-6)+x(8+x)=74

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Solution for (x-6)+x(8+x)=74 equation:


Simplifying
(x + -6) + x(8 + x) = 74

Reorder the terms:
(-6 + x) + x(8 + x) = 74

Remove parenthesis around (-6 + x)
-6 + x + x(8 + x) = 74
-6 + x + (8 * x + x * x) = 74
-6 + x + (8x + x2) = 74

Combine like terms: x + 8x = 9x
-6 + 9x + x2 = 74

Solving
-6 + 9x + x2 = 74

Solving for variable 'x'.

Reorder the terms:
-6 + -74 + 9x + x2 = 74 + -74

Combine like terms: -6 + -74 = -80
-80 + 9x + x2 = 74 + -74

Combine like terms: 74 + -74 = 0
-80 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 9x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + 9x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 9x + x2 = 0 + 80
9x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
9x + x2 = 80

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 80 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 80 + 20.25

Combine like terms: 80 + 20.25 = 100.25
20.25 + 9x + x2 = 100.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 100.25

Calculate the square root of the right side: 10.012492197

Break this problem into two subproblems by setting 
(x + 4.5) equal to 10.012492197 and -10.012492197.

Subproblem 1

x + 4.5 = 10.012492197 Simplifying x + 4.5 = 10.012492197 Reorder the terms: 4.5 + x = 10.012492197 Solving 4.5 + x = 10.012492197 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 10.012492197 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 10.012492197 + -4.5 x = 10.012492197 + -4.5 Combine like terms: 10.012492197 + -4.5 = 5.512492197 x = 5.512492197 Simplifying x = 5.512492197

Subproblem 2

x + 4.5 = -10.012492197 Simplifying x + 4.5 = -10.012492197 Reorder the terms: 4.5 + x = -10.012492197 Solving 4.5 + x = -10.012492197 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -10.012492197 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -10.012492197 + -4.5 x = -10.012492197 + -4.5 Combine like terms: -10.012492197 + -4.5 = -14.512492197 x = -14.512492197 Simplifying x = -14.512492197

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.512492197, -14.512492197}

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