3x(-4)(5-x)=7x+2

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Solution for 3x(-4)(5-x)=7x+2 equation:


Simplifying
3x(-4)(5 + -1x) = 7x + 2

Reorder the terms for easier multiplication:
3 * -4x(5 + -1x) = 7x + 2

Multiply 3 * -4
-12x(5 + -1x) = 7x + 2
(5 * -12x + -1x * -12x) = 7x + 2
(-60x + 12x2) = 7x + 2

Reorder the terms:
-60x + 12x2 = 2 + 7x

Solving
-60x + 12x2 = 2 + 7x

Solving for variable 'x'.

Reorder the terms:
-2 + -60x + -7x + 12x2 = 2 + 7x + -2 + -7x

Combine like terms: -60x + -7x = -67x
-2 + -67x + 12x2 = 2 + 7x + -2 + -7x

Reorder the terms:
-2 + -67x + 12x2 = 2 + -2 + 7x + -7x

Combine like terms: 2 + -2 = 0
-2 + -67x + 12x2 = 0 + 7x + -7x
-2 + -67x + 12x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-2 + -67x + 12x2 = 0

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

Divide each side by '12'.
-0.1666666667 + -5.583333333x + x2 = 0

Move the constant term to the right:

Add '0.1666666667' to each side of the equation.
-0.1666666667 + -5.583333333x + 0.1666666667 + x2 = 0 + 0.1666666667

Reorder the terms:
-0.1666666667 + 0.1666666667 + -5.583333333x + x2 = 0 + 0.1666666667

Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000
0.0000000000 + -5.583333333x + x2 = 0 + 0.1666666667
-5.583333333x + x2 = 0 + 0.1666666667

Combine like terms: 0 + 0.1666666667 = 0.1666666667
-5.583333333x + x2 = 0.1666666667

The x term is -5.583333333x.  Take half its coefficient (-2.791666667).
Square it (7.793402780) and add it to both sides.

Add '7.793402780' to each side of the equation.
-5.583333333x + 7.793402780 + x2 = 0.1666666667 + 7.793402780

Reorder the terms:
7.793402780 + -5.583333333x + x2 = 0.1666666667 + 7.793402780

Combine like terms: 0.1666666667 + 7.793402780 = 7.9600694467
7.793402780 + -5.583333333x + x2 = 7.9600694467

Factor a perfect square on the left side:
(x + -2.791666667)(x + -2.791666667) = 7.9600694467

Calculate the square root of the right side: 2.821359503

Break this problem into two subproblems by setting 
(x + -2.791666667) equal to 2.821359503 and -2.821359503.

Subproblem 1

x + -2.791666667 = 2.821359503 Simplifying x + -2.791666667 = 2.821359503 Reorder the terms: -2.791666667 + x = 2.821359503 Solving -2.791666667 + x = 2.821359503 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.791666667' to each side of the equation. -2.791666667 + 2.791666667 + x = 2.821359503 + 2.791666667 Combine like terms: -2.791666667 + 2.791666667 = 0.000000000 0.000000000 + x = 2.821359503 + 2.791666667 x = 2.821359503 + 2.791666667 Combine like terms: 2.821359503 + 2.791666667 = 5.61302617 x = 5.61302617 Simplifying x = 5.61302617

Subproblem 2

x + -2.791666667 = -2.821359503 Simplifying x + -2.791666667 = -2.821359503 Reorder the terms: -2.791666667 + x = -2.821359503 Solving -2.791666667 + x = -2.821359503 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.791666667' to each side of the equation. -2.791666667 + 2.791666667 + x = -2.821359503 + 2.791666667 Combine like terms: -2.791666667 + 2.791666667 = 0.000000000 0.000000000 + x = -2.821359503 + 2.791666667 x = -2.821359503 + 2.791666667 Combine like terms: -2.821359503 + 2.791666667 = -0.029692836 x = -0.029692836 Simplifying x = -0.029692836

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.61302617, -0.029692836}

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