5x^2-23x-16=0

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Solution for 5x^2-23x-16=0 equation:


Simplifying
5x2 + -23x + -16 = 0

Reorder the terms:
-16 + -23x + 5x2 = 0

Solving
-16 + -23x + 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'.
-3.2 + -4.6x + x2 = 0

Move the constant term to the right:

Add '3.2' to each side of the equation.
-3.2 + -4.6x + 3.2 + x2 = 0 + 3.2

Reorder the terms:
-3.2 + 3.2 + -4.6x + x2 = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + -4.6x + x2 = 0 + 3.2
-4.6x + x2 = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
-4.6x + x2 = 3.2

The x term is -4.6x.  Take half its coefficient (-2.3).
Square it (5.29) and add it to both sides.

Add '5.29' to each side of the equation.
-4.6x + 5.29 + x2 = 3.2 + 5.29

Reorder the terms:
5.29 + -4.6x + x2 = 3.2 + 5.29

Combine like terms: 3.2 + 5.29 = 8.49
5.29 + -4.6x + x2 = 8.49

Factor a perfect square on the left side:
(x + -2.3)(x + -2.3) = 8.49

Calculate the square root of the right side: 2.913760457

Break this problem into two subproblems by setting 
(x + -2.3) equal to 2.913760457 and -2.913760457.

Subproblem 1

x + -2.3 = 2.913760457 Simplifying x + -2.3 = 2.913760457 Reorder the terms: -2.3 + x = 2.913760457 Solving -2.3 + x = 2.913760457 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.3' to each side of the equation. -2.3 + 2.3 + x = 2.913760457 + 2.3 Combine like terms: -2.3 + 2.3 = 0.0 0.0 + x = 2.913760457 + 2.3 x = 2.913760457 + 2.3 Combine like terms: 2.913760457 + 2.3 = 5.213760457 x = 5.213760457 Simplifying x = 5.213760457

Subproblem 2

x + -2.3 = -2.913760457 Simplifying x + -2.3 = -2.913760457 Reorder the terms: -2.3 + x = -2.913760457 Solving -2.3 + x = -2.913760457 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.3' to each side of the equation. -2.3 + 2.3 + x = -2.913760457 + 2.3 Combine like terms: -2.3 + 2.3 = 0.0 0.0 + x = -2.913760457 + 2.3 x = -2.913760457 + 2.3 Combine like terms: -2.913760457 + 2.3 = -0.613760457 x = -0.613760457 Simplifying x = -0.613760457

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.213760457, -0.613760457}

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