5x^2-16x-12=0

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Solution for 5x^2-16x-12=0 equation:


Simplifying
5x2 + -16x + -12 = 0

Reorder the terms:
-12 + -16x + 5x2 = 0

Solving
-12 + -16x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-2.4 + -3.2x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -3.2x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -3.2x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -3.2x + x2 = 0 + 2.4
-3.2x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-3.2x + x2 = 2.4

The x term is -3.2x.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2x + 2.56 + x2 = 2.4 + 2.56

Reorder the terms:
2.56 + -3.2x + x2 = 2.4 + 2.56

Combine like terms: 2.4 + 2.56 = 4.96
2.56 + -3.2x + x2 = 4.96

Factor a perfect square on the left side:
(x + -1.6)(x + -1.6) = 4.96

Calculate the square root of the right side: 2.227105745

Break this problem into two subproblems by setting 
(x + -1.6) equal to 2.227105745 and -2.227105745.

Subproblem 1

x + -1.6 = 2.227105745 Simplifying x + -1.6 = 2.227105745 Reorder the terms: -1.6 + x = 2.227105745 Solving -1.6 + x = 2.227105745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = 2.227105745 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = 2.227105745 + 1.6 x = 2.227105745 + 1.6 Combine like terms: 2.227105745 + 1.6 = 3.827105745 x = 3.827105745 Simplifying x = 3.827105745

Subproblem 2

x + -1.6 = -2.227105745 Simplifying x + -1.6 = -2.227105745 Reorder the terms: -1.6 + x = -2.227105745 Solving -1.6 + x = -2.227105745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = -2.227105745 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = -2.227105745 + 1.6 x = -2.227105745 + 1.6 Combine like terms: -2.227105745 + 1.6 = -0.627105745 x = -0.627105745 Simplifying x = -0.627105745

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.827105745, -0.627105745}

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