2X^2+4X-141=0

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Solution for 2X^2+4X-141=0 equation:


Simplifying
2X2 + 4X + -141 = 0

Reorder the terms:
-141 + 4X + 2X2 = 0

Solving
-141 + 4X + 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'.
-70.5 + 2X + X2 = 0

Move the constant term to the right:

Add '70.5' to each side of the equation.
-70.5 + 2X + 70.5 + X2 = 0 + 70.5

Reorder the terms:
-70.5 + 70.5 + 2X + X2 = 0 + 70.5

Combine like terms: -70.5 + 70.5 = 0.0
0.0 + 2X + X2 = 0 + 70.5
2X + X2 = 0 + 70.5

Combine like terms: 0 + 70.5 = 70.5
2X + X2 = 70.5

The X term is 2X.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2X + 1 + X2 = 70.5 + 1

Reorder the terms:
1 + 2X + X2 = 70.5 + 1

Combine like terms: 70.5 + 1 = 71.5
1 + 2X + X2 = 71.5

Factor a perfect square on the left side:
(X + 1)(X + 1) = 71.5

Calculate the square root of the right side: 8.455767263

Break this problem into two subproblems by setting 
(X + 1) equal to 8.455767263 and -8.455767263.

Subproblem 1

X + 1 = 8.455767263 Simplifying X + 1 = 8.455767263 Reorder the terms: 1 + X = 8.455767263 Solving 1 + X = 8.455767263 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + X = 8.455767263 + -1 Combine like terms: 1 + -1 = 0 0 + X = 8.455767263 + -1 X = 8.455767263 + -1 Combine like terms: 8.455767263 + -1 = 7.455767263 X = 7.455767263 Simplifying X = 7.455767263

Subproblem 2

X + 1 = -8.455767263 Simplifying X + 1 = -8.455767263 Reorder the terms: 1 + X = -8.455767263 Solving 1 + X = -8.455767263 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + X = -8.455767263 + -1 Combine like terms: 1 + -1 = 0 0 + X = -8.455767263 + -1 X = -8.455767263 + -1 Combine like terms: -8.455767263 + -1 = -9.455767263 X = -9.455767263 Simplifying X = -9.455767263

Solution

The solution to the problem is based on the solutions from the subproblems. X = {7.455767263, -9.455767263}

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