(2x^2)-7x-76=0

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Solution for (2x^2)-7x-76=0 equation:


Simplifying
(2x2) + -7x + -76 = 0

Reorder the terms:
-76 + -7x + (2x2) = 0

Solving
-76 + -7x + (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 + -3.5x + x2 = 0

Move the constant term to the right:

Add '38' to each side of the equation.
-38 + -3.5x + 38 + x2 = 0 + 38

Reorder the terms:
-38 + 38 + -3.5x + x2 = 0 + 38

Combine like terms: -38 + 38 = 0
0 + -3.5x + x2 = 0 + 38
-3.5x + x2 = 0 + 38

Combine like terms: 0 + 38 = 38
-3.5x + x2 = 38

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 38 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 38 + 3.0625

Combine like terms: 38 + 3.0625 = 41.0625
3.0625 + -3.5x + x2 = 41.0625

Factor a perfect square on the left side:
((x) + -1.75)((x) + -1.75) = 41.0625

Calculate the square root of the right side: 6.408002809

Break this problem into two subproblems by setting 
((x) + -1.75) equal to 6.408002809 and -6.408002809.

Subproblem 1

(x) + -1.75 = 6.408002809 Simplifying (x) + -1.75 = 6.408002809 x + -1.75 = 6.408002809 Reorder the terms: -1.75 + x = 6.408002809 Solving -1.75 + x = 6.408002809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 6.408002809 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 6.408002809 + 1.75 x = 6.408002809 + 1.75 Combine like terms: 6.408002809 + 1.75 = 8.158002809 x = 8.158002809 Simplifying x = 8.158002809

Subproblem 2

(x) + -1.75 = -6.408002809 Simplifying (x) + -1.75 = -6.408002809 x + -1.75 = -6.408002809 Reorder the terms: -1.75 + x = -6.408002809 Solving -1.75 + x = -6.408002809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -6.408002809 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -6.408002809 + 1.75 x = -6.408002809 + 1.75 Combine like terms: -6.408002809 + 1.75 = -4.658002809 x = -4.658002809 Simplifying x = -4.658002809

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.158002809, -4.658002809}

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