0=x^2+31x-94

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Solution for 0=x^2+31x-94 equation:


Simplifying
0 = x2 + 31x + -94

Reorder the terms:
0 = -94 + 31x + x2

Solving
0 = -94 + 31x + x2

Solving for variable 'x'.

Combine like terms: 0 + 94 = 94
94 + -31x + -1x2 = -94 + 31x + x2 + 94 + -31x + -1x2

Reorder the terms:
94 + -31x + -1x2 = -94 + 94 + 31x + -31x + x2 + -1x2

Combine like terms: -94 + 94 = 0
94 + -31x + -1x2 = 0 + 31x + -31x + x2 + -1x2
94 + -31x + -1x2 = 31x + -31x + x2 + -1x2

Combine like terms: 31x + -31x = 0
94 + -31x + -1x2 = 0 + x2 + -1x2
94 + -31x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
94 + -31x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-94 + 31x + x2 = 0

Move the constant term to the right:

Add '94' to each side of the equation.
-94 + 31x + 94 + x2 = 0 + 94

Reorder the terms:
-94 + 94 + 31x + x2 = 0 + 94

Combine like terms: -94 + 94 = 0
0 + 31x + x2 = 0 + 94
31x + x2 = 0 + 94

Combine like terms: 0 + 94 = 94
31x + x2 = 94

The x term is 31x.  Take half its coefficient (15.5).
Square it (240.25) and add it to both sides.

Add '240.25' to each side of the equation.
31x + 240.25 + x2 = 94 + 240.25

Reorder the terms:
240.25 + 31x + x2 = 94 + 240.25

Combine like terms: 94 + 240.25 = 334.25
240.25 + 31x + x2 = 334.25

Factor a perfect square on the left side:
(x + 15.5)(x + 15.5) = 334.25

Calculate the square root of the right side: 18.282505299

Break this problem into two subproblems by setting 
(x + 15.5) equal to 18.282505299 and -18.282505299.

Subproblem 1

x + 15.5 = 18.282505299 Simplifying x + 15.5 = 18.282505299 Reorder the terms: 15.5 + x = 18.282505299 Solving 15.5 + x = 18.282505299 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15.5' to each side of the equation. 15.5 + -15.5 + x = 18.282505299 + -15.5 Combine like terms: 15.5 + -15.5 = 0.0 0.0 + x = 18.282505299 + -15.5 x = 18.282505299 + -15.5 Combine like terms: 18.282505299 + -15.5 = 2.782505299 x = 2.782505299 Simplifying x = 2.782505299

Subproblem 2

x + 15.5 = -18.282505299 Simplifying x + 15.5 = -18.282505299 Reorder the terms: 15.5 + x = -18.282505299 Solving 15.5 + x = -18.282505299 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15.5' to each side of the equation. 15.5 + -15.5 + x = -18.282505299 + -15.5 Combine like terms: 15.5 + -15.5 = 0.0 0.0 + x = -18.282505299 + -15.5 x = -18.282505299 + -15.5 Combine like terms: -18.282505299 + -15.5 = -33.782505299 x = -33.782505299 Simplifying x = -33.782505299

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.782505299, -33.782505299}

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