2x^2-3x-76=0

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Solution for 2x^2-3x-76=0 equation:


Simplifying
2x2 + -3x + -76 = 0

Reorder the terms:
-76 + -3x + 2x2 = 0

Solving
-76 + -3x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-38 + -1.5x + x2 = 0

Move the constant term to the right:

Add '38' to each side of the equation.
-38 + -1.5x + 38 + x2 = 0 + 38

Reorder the terms:
-38 + 38 + -1.5x + x2 = 0 + 38

Combine like terms: -38 + 38 = 0
0 + -1.5x + x2 = 0 + 38
-1.5x + x2 = 0 + 38

Combine like terms: 0 + 38 = 38
-1.5x + x2 = 38

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 38 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 38 + 0.5625

Combine like terms: 38 + 0.5625 = 38.5625
0.5625 + -1.5x + x2 = 38.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 38.5625

Calculate the square root of the right side: 6.209871174

Break this problem into two subproblems by setting 
(x + -0.75) equal to 6.209871174 and -6.209871174.

Subproblem 1

x + -0.75 = 6.209871174 Simplifying x + -0.75 = 6.209871174 Reorder the terms: -0.75 + x = 6.209871174 Solving -0.75 + x = 6.209871174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 6.209871174 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 6.209871174 + 0.75 x = 6.209871174 + 0.75 Combine like terms: 6.209871174 + 0.75 = 6.959871174 x = 6.959871174 Simplifying x = 6.959871174

Subproblem 2

x + -0.75 = -6.209871174 Simplifying x + -0.75 = -6.209871174 Reorder the terms: -0.75 + x = -6.209871174 Solving -0.75 + x = -6.209871174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -6.209871174 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -6.209871174 + 0.75 x = -6.209871174 + 0.75 Combine like terms: -6.209871174 + 0.75 = -5.459871174 x = -5.459871174 Simplifying x = -5.459871174

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.959871174, -5.459871174}

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