5x^2-8=12x

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Solution for 5x^2-8=12x equation:


Simplifying
5x2 + -8 = 12x

Reorder the terms:
-8 + 5x2 = 12x

Solving
-8 + 5x2 = 12x

Solving for variable 'x'.

Reorder the terms:
-8 + -12x + 5x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
-8 + -12x + 5x2 = 0

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

Divide each side by '5'.
-1.6 + -2.4x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -2.4x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -2.4x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -2.4x + x2 = 0 + 1.6
-2.4x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-2.4x + x2 = 1.6

The x term is -2.4x.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4x + 1.44 + x2 = 1.6 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 1.6 + 1.44

Combine like terms: 1.6 + 1.44 = 3.04
1.44 + -2.4x + x2 = 3.04

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 3.04

Calculate the square root of the right side: 1.743559577

Break this problem into two subproblems by setting 
(x + -1.2) equal to 1.743559577 and -1.743559577.

Subproblem 1

x + -1.2 = 1.743559577 Simplifying x + -1.2 = 1.743559577 Reorder the terms: -1.2 + x = 1.743559577 Solving -1.2 + x = 1.743559577 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = 1.743559577 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 1.743559577 + 1.2 x = 1.743559577 + 1.2 Combine like terms: 1.743559577 + 1.2 = 2.943559577 x = 2.943559577 Simplifying x = 2.943559577

Subproblem 2

x + -1.2 = -1.743559577 Simplifying x + -1.2 = -1.743559577 Reorder the terms: -1.2 + x = -1.743559577 Solving -1.2 + x = -1.743559577 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = -1.743559577 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -1.743559577 + 1.2 x = -1.743559577 + 1.2 Combine like terms: -1.743559577 + 1.2 = -0.543559577 x = -0.543559577 Simplifying x = -0.543559577

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.943559577, -0.543559577}

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