3(x-8)5x+7=0

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Solution for 3(x-8)5x+7=0 equation:


Simplifying
3(x + -8) * 5x + 7 = 0

Reorder the terms:
3(-8 + x) * 5x + 7 = 0

Reorder the terms for easier multiplication:
3 * 5x(-8 + x) + 7 = 0

Multiply 3 * 5
15x(-8 + x) + 7 = 0
(-8 * 15x + x * 15x) + 7 = 0
(-120x + 15x2) + 7 = 0

Reorder the terms:
7 + -120x + 15x2 = 0

Solving
7 + -120x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
0.4666666667 + -8x + x2 = 0

Move the constant term to the right:

Add '-0.4666666667' to each side of the equation.
0.4666666667 + -8x + -0.4666666667 + x2 = 0 + -0.4666666667

Reorder the terms:
0.4666666667 + -0.4666666667 + -8x + x2 = 0 + -0.4666666667

Combine like terms: 0.4666666667 + -0.4666666667 = 0.0000000000
0.0000000000 + -8x + x2 = 0 + -0.4666666667
-8x + x2 = 0 + -0.4666666667

Combine like terms: 0 + -0.4666666667 = -0.4666666667
-8x + x2 = -0.4666666667

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -0.4666666667 + 16

Reorder the terms:
16 + -8x + x2 = -0.4666666667 + 16

Combine like terms: -0.4666666667 + 16 = 15.5333333333
16 + -8x + x2 = 15.5333333333

Factor a perfect square on the left side:
(x + -4)(x + -4) = 15.5333333333

Calculate the square root of the right side: 3.941235001

Break this problem into two subproblems by setting 
(x + -4) equal to 3.941235001 and -3.941235001.

Subproblem 1

x + -4 = 3.941235001 Simplifying x + -4 = 3.941235001 Reorder the terms: -4 + x = 3.941235001 Solving -4 + x = 3.941235001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 3.941235001 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.941235001 + 4 x = 3.941235001 + 4 Combine like terms: 3.941235001 + 4 = 7.941235001 x = 7.941235001 Simplifying x = 7.941235001

Subproblem 2

x + -4 = -3.941235001 Simplifying x + -4 = -3.941235001 Reorder the terms: -4 + x = -3.941235001 Solving -4 + x = -3.941235001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -3.941235001 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.941235001 + 4 x = -3.941235001 + 4 Combine like terms: -3.941235001 + 4 = 0.058764999 x = 0.058764999 Simplifying x = 0.058764999

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.941235001, 0.058764999}

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