x^2+5x-247=12

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Solution for x^2+5x-247=12 equation:


Simplifying
x2 + 5x + -247 = 12

Reorder the terms:
-247 + 5x + x2 = 12

Solving
-247 + 5x + x2 = 12

Solving for variable 'x'.

Reorder the terms:
-247 + -12 + 5x + x2 = 12 + -12

Combine like terms: -247 + -12 = -259
-259 + 5x + x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-259 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '259' to each side of the equation.
-259 + 5x + 259 + x2 = 0 + 259

Reorder the terms:
-259 + 259 + 5x + x2 = 0 + 259

Combine like terms: -259 + 259 = 0
0 + 5x + x2 = 0 + 259
5x + x2 = 0 + 259

Combine like terms: 0 + 259 = 259
5x + x2 = 259

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 259 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 259 + 6.25

Combine like terms: 259 + 6.25 = 265.25
6.25 + 5x + x2 = 265.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 265.25

Calculate the square root of the right side: 16.286497475

Break this problem into two subproblems by setting 
(x + 2.5) equal to 16.286497475 and -16.286497475.

Subproblem 1

x + 2.5 = 16.286497475 Simplifying x + 2.5 = 16.286497475 Reorder the terms: 2.5 + x = 16.286497475 Solving 2.5 + x = 16.286497475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 16.286497475 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 16.286497475 + -2.5 x = 16.286497475 + -2.5 Combine like terms: 16.286497475 + -2.5 = 13.786497475 x = 13.786497475 Simplifying x = 13.786497475

Subproblem 2

x + 2.5 = -16.286497475 Simplifying x + 2.5 = -16.286497475 Reorder the terms: 2.5 + x = -16.286497475 Solving 2.5 + x = -16.286497475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -16.286497475 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -16.286497475 + -2.5 x = -16.286497475 + -2.5 Combine like terms: -16.286497475 + -2.5 = -18.786497475 x = -18.786497475 Simplifying x = -18.786497475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.786497475, -18.786497475}

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