10x(x-8)=3x-66

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Solution for 10x(x-8)=3x-66 equation:


Simplifying
10x(x + -8) = 3x + -66

Reorder the terms:
10x(-8 + x) = 3x + -66
(-8 * 10x + x * 10x) = 3x + -66
(-80x + 10x2) = 3x + -66

Reorder the terms:
-80x + 10x2 = -66 + 3x

Solving
-80x + 10x2 = -66 + 3x

Solving for variable 'x'.

Reorder the terms:
66 + -80x + -3x + 10x2 = -66 + 3x + 66 + -3x

Combine like terms: -80x + -3x = -83x
66 + -83x + 10x2 = -66 + 3x + 66 + -3x

Reorder the terms:
66 + -83x + 10x2 = -66 + 66 + 3x + -3x

Combine like terms: -66 + 66 = 0
66 + -83x + 10x2 = 0 + 3x + -3x
66 + -83x + 10x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
66 + -83x + 10x2 = 0

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

Divide each side by '10'.
6.6 + -8.3x + x2 = 0

Move the constant term to the right:

Add '-6.6' to each side of the equation.
6.6 + -8.3x + -6.6 + x2 = 0 + -6.6

Reorder the terms:
6.6 + -6.6 + -8.3x + x2 = 0 + -6.6

Combine like terms: 6.6 + -6.6 = 0.0
0.0 + -8.3x + x2 = 0 + -6.6
-8.3x + x2 = 0 + -6.6

Combine like terms: 0 + -6.6 = -6.6
-8.3x + x2 = -6.6

The x term is -8.3x.  Take half its coefficient (-4.15).
Square it (17.2225) and add it to both sides.

Add '17.2225' to each side of the equation.
-8.3x + 17.2225 + x2 = -6.6 + 17.2225

Reorder the terms:
17.2225 + -8.3x + x2 = -6.6 + 17.2225

Combine like terms: -6.6 + 17.2225 = 10.6225
17.2225 + -8.3x + x2 = 10.6225

Factor a perfect square on the left side:
(x + -4.15)(x + -4.15) = 10.6225

Calculate the square root of the right side: 3.259217698

Break this problem into two subproblems by setting 
(x + -4.15) equal to 3.259217698 and -3.259217698.

Subproblem 1

x + -4.15 = 3.259217698 Simplifying x + -4.15 = 3.259217698 Reorder the terms: -4.15 + x = 3.259217698 Solving -4.15 + x = 3.259217698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.15' to each side of the equation. -4.15 + 4.15 + x = 3.259217698 + 4.15 Combine like terms: -4.15 + 4.15 = 0.00 0.00 + x = 3.259217698 + 4.15 x = 3.259217698 + 4.15 Combine like terms: 3.259217698 + 4.15 = 7.409217698 x = 7.409217698 Simplifying x = 7.409217698

Subproblem 2

x + -4.15 = -3.259217698 Simplifying x + -4.15 = -3.259217698 Reorder the terms: -4.15 + x = -3.259217698 Solving -4.15 + x = -3.259217698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.15' to each side of the equation. -4.15 + 4.15 + x = -3.259217698 + 4.15 Combine like terms: -4.15 + 4.15 = 0.00 0.00 + x = -3.259217698 + 4.15 x = -3.259217698 + 4.15 Combine like terms: -3.259217698 + 4.15 = 0.890782302 x = 0.890782302 Simplifying x = 0.890782302

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.409217698, 0.890782302}

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