5*x^2-17x-64=0

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Solution for 5*x^2-17x-64=0 equation:


Simplifying
5x2 + -17x + -64 = 0

Reorder the terms:
-64 + -17x + 5x2 = 0

Solving
-64 + -17x + 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'.
-12.8 + -3.4x + x2 = 0

Move the constant term to the right:

Add '12.8' to each side of the equation.
-12.8 + -3.4x + 12.8 + x2 = 0 + 12.8

Reorder the terms:
-12.8 + 12.8 + -3.4x + x2 = 0 + 12.8

Combine like terms: -12.8 + 12.8 = 0.0
0.0 + -3.4x + x2 = 0 + 12.8
-3.4x + x2 = 0 + 12.8

Combine like terms: 0 + 12.8 = 12.8
-3.4x + x2 = 12.8

The x term is -3.4x.  Take half its coefficient (-1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
-3.4x + 2.89 + x2 = 12.8 + 2.89

Reorder the terms:
2.89 + -3.4x + x2 = 12.8 + 2.89

Combine like terms: 12.8 + 2.89 = 15.69
2.89 + -3.4x + x2 = 15.69

Factor a perfect square on the left side:
(x + -1.7)(x + -1.7) = 15.69

Calculate the square root of the right side: 3.961060464

Break this problem into two subproblems by setting 
(x + -1.7) equal to 3.961060464 and -3.961060464.

Subproblem 1

x + -1.7 = 3.961060464 Simplifying x + -1.7 = 3.961060464 Reorder the terms: -1.7 + x = 3.961060464 Solving -1.7 + x = 3.961060464 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = 3.961060464 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = 3.961060464 + 1.7 x = 3.961060464 + 1.7 Combine like terms: 3.961060464 + 1.7 = 5.661060464 x = 5.661060464 Simplifying x = 5.661060464

Subproblem 2

x + -1.7 = -3.961060464 Simplifying x + -1.7 = -3.961060464 Reorder the terms: -1.7 + x = -3.961060464 Solving -1.7 + x = -3.961060464 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = -3.961060464 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = -3.961060464 + 1.7 x = -3.961060464 + 1.7 Combine like terms: -3.961060464 + 1.7 = -2.261060464 x = -2.261060464 Simplifying x = -2.261060464

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.661060464, -2.261060464}

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