5x^2-16x-6=0

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Solution for 5x^2-16x-6=0 equation:


Simplifying
5x2 + -16x + -6 = 0

Reorder the terms:
-6 + -16x + 5x2 = 0

Solving
-6 + -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'.
-1.2 + -3.2x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + -3.2x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + -3.2x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + -3.2x + x2 = 0 + 1.2
-3.2x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
-3.2x + x2 = 1.2

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 = 1.2 + 2.56

Reorder the terms:
2.56 + -3.2x + x2 = 1.2 + 2.56

Combine like terms: 1.2 + 2.56 = 3.76
2.56 + -3.2x + x2 = 3.76

Factor a perfect square on the left side:
(x + -1.6)(x + -1.6) = 3.76

Calculate the square root of the right side: 1.939071943

Break this problem into two subproblems by setting 
(x + -1.6) equal to 1.939071943 and -1.939071943.

Subproblem 1

x + -1.6 = 1.939071943 Simplifying x + -1.6 = 1.939071943 Reorder the terms: -1.6 + x = 1.939071943 Solving -1.6 + x = 1.939071943 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 = 1.939071943 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = 1.939071943 + 1.6 x = 1.939071943 + 1.6 Combine like terms: 1.939071943 + 1.6 = 3.539071943 x = 3.539071943 Simplifying x = 3.539071943

Subproblem 2

x + -1.6 = -1.939071943 Simplifying x + -1.6 = -1.939071943 Reorder the terms: -1.6 + x = -1.939071943 Solving -1.6 + x = -1.939071943 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 = -1.939071943 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = -1.939071943 + 1.6 x = -1.939071943 + 1.6 Combine like terms: -1.939071943 + 1.6 = -0.339071943 x = -0.339071943 Simplifying x = -0.339071943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.539071943, -0.339071943}

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