1.75x^2-2x-64=0

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Solution for 1.75x^2-2x-64=0 equation:


Simplifying
1.75x2 + -2x + -64 = 0

Reorder the terms:
-64 + -2x + 1.75x2 = 0

Solving
-64 + -2x + 1.75x2 = 0

Solving for variable 'x'.

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

Divide each side by '1.75'.
-36.57142857 + -1.142857143x + x2 = 0

Move the constant term to the right:

Add '36.57142857' to each side of the equation.
-36.57142857 + -1.142857143x + 36.57142857 + x2 = 0 + 36.57142857

Reorder the terms:
-36.57142857 + 36.57142857 + -1.142857143x + x2 = 0 + 36.57142857

Combine like terms: -36.57142857 + 36.57142857 = 0.00000000
0.00000000 + -1.142857143x + x2 = 0 + 36.57142857
-1.142857143x + x2 = 0 + 36.57142857

Combine like terms: 0 + 36.57142857 = 36.57142857
-1.142857143x + x2 = 36.57142857

The x term is -1.142857143x.  Take half its coefficient (-0.5714285715).
Square it (0.3265306123) and add it to both sides.

Add '0.3265306123' to each side of the equation.
-1.142857143x + 0.3265306123 + x2 = 36.57142857 + 0.3265306123

Reorder the terms:
0.3265306123 + -1.142857143x + x2 = 36.57142857 + 0.3265306123

Combine like terms: 36.57142857 + 0.3265306123 = 36.8979591823
0.3265306123 + -1.142857143x + x2 = 36.8979591823

Factor a perfect square on the left side:
(x + -0.5714285715)(x + -0.5714285715) = 36.8979591823

Calculate the square root of the right side: 6.074369036

Break this problem into two subproblems by setting 
(x + -0.5714285715) equal to 6.074369036 and -6.074369036.

Subproblem 1

x + -0.5714285715 = 6.074369036 Simplifying x + -0.5714285715 = 6.074369036 Reorder the terms: -0.5714285715 + x = 6.074369036 Solving -0.5714285715 + x = 6.074369036 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5714285715' to each side of the equation. -0.5714285715 + 0.5714285715 + x = 6.074369036 + 0.5714285715 Combine like terms: -0.5714285715 + 0.5714285715 = 0.0000000000 0.0000000000 + x = 6.074369036 + 0.5714285715 x = 6.074369036 + 0.5714285715 Combine like terms: 6.074369036 + 0.5714285715 = 6.6457976075 x = 6.6457976075 Simplifying x = 6.6457976075

Subproblem 2

x + -0.5714285715 = -6.074369036 Simplifying x + -0.5714285715 = -6.074369036 Reorder the terms: -0.5714285715 + x = -6.074369036 Solving -0.5714285715 + x = -6.074369036 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5714285715' to each side of the equation. -0.5714285715 + 0.5714285715 + x = -6.074369036 + 0.5714285715 Combine like terms: -0.5714285715 + 0.5714285715 = 0.0000000000 0.0000000000 + x = -6.074369036 + 0.5714285715 x = -6.074369036 + 0.5714285715 Combine like terms: -6.074369036 + 0.5714285715 = -5.5029404645 x = -5.5029404645 Simplifying x = -5.5029404645

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.6457976075, -5.5029404645}

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