5x^2-8x-94=0

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Solution for 5x^2-8x-94=0 equation:


Simplifying
5x2 + -8x + -94 = 0

Reorder the terms:
-94 + -8x + 5x2 = 0

Solving
-94 + -8x + 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'.
-18.8 + -1.6x + x2 = 0

Move the constant term to the right:

Add '18.8' to each side of the equation.
-18.8 + -1.6x + 18.8 + x2 = 0 + 18.8

Reorder the terms:
-18.8 + 18.8 + -1.6x + x2 = 0 + 18.8

Combine like terms: -18.8 + 18.8 = 0.0
0.0 + -1.6x + x2 = 0 + 18.8
-1.6x + x2 = 0 + 18.8

Combine like terms: 0 + 18.8 = 18.8
-1.6x + x2 = 18.8

The x term is -1.6x.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x + 0.64 + x2 = 18.8 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = 18.8 + 0.64

Combine like terms: 18.8 + 0.64 = 19.44
0.64 + -1.6x + x2 = 19.44

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 19.44

Calculate the square root of the right side: 4.409081537

Break this problem into two subproblems by setting 
(x + -0.8) equal to 4.409081537 and -4.409081537.

Subproblem 1

x + -0.8 = 4.409081537 Simplifying x + -0.8 = 4.409081537 Reorder the terms: -0.8 + x = 4.409081537 Solving -0.8 + x = 4.409081537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 4.409081537 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 4.409081537 + 0.8 x = 4.409081537 + 0.8 Combine like terms: 4.409081537 + 0.8 = 5.209081537 x = 5.209081537 Simplifying x = 5.209081537

Subproblem 2

x + -0.8 = -4.409081537 Simplifying x + -0.8 = -4.409081537 Reorder the terms: -0.8 + x = -4.409081537 Solving -0.8 + x = -4.409081537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -4.409081537 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -4.409081537 + 0.8 x = -4.409081537 + 0.8 Combine like terms: -4.409081537 + 0.8 = -3.609081537 x = -3.609081537 Simplifying x = -3.609081537

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.209081537, -3.609081537}

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