-8x^2-119x+312=0

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Solution for -8x^2-119x+312=0 equation:


Simplifying
-8x2 + -119x + 312 = 0

Reorder the terms:
312 + -119x + -8x2 = 0

Solving
312 + -119x + -8x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-39 + 14.875x + x2 = 0

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + 14.875x + 39 + x2 = 0 + 39

Reorder the terms:
-39 + 39 + 14.875x + x2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + 14.875x + x2 = 0 + 39
14.875x + x2 = 0 + 39

Combine like terms: 0 + 39 = 39
14.875x + x2 = 39

The x term is 14.875x.  Take half its coefficient (7.4375).
Square it (55.31640625) and add it to both sides.

Add '55.31640625' to each side of the equation.
14.875x + 55.31640625 + x2 = 39 + 55.31640625

Reorder the terms:
55.31640625 + 14.875x + x2 = 39 + 55.31640625

Combine like terms: 39 + 55.31640625 = 94.31640625
55.31640625 + 14.875x + x2 = 94.31640625

Factor a perfect square on the left side:
(x + 7.4375)(x + 7.4375) = 94.31640625

Calculate the square root of the right side: 9.711663413

Break this problem into two subproblems by setting 
(x + 7.4375) equal to 9.711663413 and -9.711663413.

Subproblem 1

x + 7.4375 = 9.711663413 Simplifying x + 7.4375 = 9.711663413 Reorder the terms: 7.4375 + x = 9.711663413 Solving 7.4375 + x = 9.711663413 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.4375' to each side of the equation. 7.4375 + -7.4375 + x = 9.711663413 + -7.4375 Combine like terms: 7.4375 + -7.4375 = 0.0000 0.0000 + x = 9.711663413 + -7.4375 x = 9.711663413 + -7.4375 Combine like terms: 9.711663413 + -7.4375 = 2.274163413 x = 2.274163413 Simplifying x = 2.274163413

Subproblem 2

x + 7.4375 = -9.711663413 Simplifying x + 7.4375 = -9.711663413 Reorder the terms: 7.4375 + x = -9.711663413 Solving 7.4375 + x = -9.711663413 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.4375' to each side of the equation. 7.4375 + -7.4375 + x = -9.711663413 + -7.4375 Combine like terms: 7.4375 + -7.4375 = 0.0000 0.0000 + x = -9.711663413 + -7.4375 x = -9.711663413 + -7.4375 Combine like terms: -9.711663413 + -7.4375 = -17.149163413 x = -17.149163413 Simplifying x = -17.149163413

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.274163413, -17.149163413}

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