5x(x-4)=7x+12

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Solution for 5x(x-4)=7x+12 equation:


Simplifying
5x(x + -4) = 7x + 12

Reorder the terms:
5x(-4 + x) = 7x + 12
(-4 * 5x + x * 5x) = 7x + 12
(-20x + 5x2) = 7x + 12

Reorder the terms:
-20x + 5x2 = 12 + 7x

Solving
-20x + 5x2 = 12 + 7x

Solving for variable 'x'.

Reorder the terms:
-12 + -20x + -7x + 5x2 = 12 + 7x + -12 + -7x

Combine like terms: -20x + -7x = -27x
-12 + -27x + 5x2 = 12 + 7x + -12 + -7x

Reorder the terms:
-12 + -27x + 5x2 = 12 + -12 + 7x + -7x

Combine like terms: 12 + -12 = 0
-12 + -27x + 5x2 = 0 + 7x + -7x
-12 + -27x + 5x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-12 + -27x + 5x2 = 0

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

Divide each side by '5'.
-2.4 + -5.4x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -5.4x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -5.4x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -5.4x + x2 = 0 + 2.4
-5.4x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-5.4x + x2 = 2.4

The x term is -5.4x.  Take half its coefficient (-2.7).
Square it (7.29) and add it to both sides.

Add '7.29' to each side of the equation.
-5.4x + 7.29 + x2 = 2.4 + 7.29

Reorder the terms:
7.29 + -5.4x + x2 = 2.4 + 7.29

Combine like terms: 2.4 + 7.29 = 9.69
7.29 + -5.4x + x2 = 9.69

Factor a perfect square on the left side:
(x + -2.7)(x + -2.7) = 9.69

Calculate the square root of the right side: 3.112876483

Break this problem into two subproblems by setting 
(x + -2.7) equal to 3.112876483 and -3.112876483.

Subproblem 1

x + -2.7 = 3.112876483 Simplifying x + -2.7 = 3.112876483 Reorder the terms: -2.7 + x = 3.112876483 Solving -2.7 + x = 3.112876483 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.7' to each side of the equation. -2.7 + 2.7 + x = 3.112876483 + 2.7 Combine like terms: -2.7 + 2.7 = 0.0 0.0 + x = 3.112876483 + 2.7 x = 3.112876483 + 2.7 Combine like terms: 3.112876483 + 2.7 = 5.812876483 x = 5.812876483 Simplifying x = 5.812876483

Subproblem 2

x + -2.7 = -3.112876483 Simplifying x + -2.7 = -3.112876483 Reorder the terms: -2.7 + x = -3.112876483 Solving -2.7 + x = -3.112876483 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.7' to each side of the equation. -2.7 + 2.7 + x = -3.112876483 + 2.7 Combine like terms: -2.7 + 2.7 = 0.0 0.0 + x = -3.112876483 + 2.7 x = -3.112876483 + 2.7 Combine like terms: -3.112876483 + 2.7 = -0.412876483 x = -0.412876483 Simplifying x = -0.412876483

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.812876483, -0.412876483}

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