5x^2+12x-41=9

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Solution for 5x^2+12x-41=9 equation:


Simplifying
5x2 + 12x + -41 = 9

Reorder the terms:
-41 + 12x + 5x2 = 9

Solving
-41 + 12x + 5x2 = 9

Solving for variable 'x'.

Reorder the terms:
-41 + -9 + 12x + 5x2 = 9 + -9

Combine like terms: -41 + -9 = -50
-50 + 12x + 5x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-50 + 12x + 5x2 = 0

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

Divide each side by '5'.
-10 + 2.4x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 2.4x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + 2.4x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 2.4x + x2 = 0 + 10
2.4x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
2.4x + x2 = 10

The x term is 2.4x.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4x + 1.44 + x2 = 10 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = 10 + 1.44

Combine like terms: 10 + 1.44 = 11.44
1.44 + 2.4x + x2 = 11.44

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 11.44

Calculate the square root of the right side: 3.382306905

Break this problem into two subproblems by setting 
(x + 1.2) equal to 3.382306905 and -3.382306905.

Subproblem 1

x + 1.2 = 3.382306905 Simplifying x + 1.2 = 3.382306905 Reorder the terms: 1.2 + x = 3.382306905 Solving 1.2 + x = 3.382306905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 3.382306905 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 3.382306905 + -1.2 x = 3.382306905 + -1.2 Combine like terms: 3.382306905 + -1.2 = 2.182306905 x = 2.182306905 Simplifying x = 2.182306905

Subproblem 2

x + 1.2 = -3.382306905 Simplifying x + 1.2 = -3.382306905 Reorder the terms: 1.2 + x = -3.382306905 Solving 1.2 + x = -3.382306905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -3.382306905 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -3.382306905 + -1.2 x = -3.382306905 + -1.2 Combine like terms: -3.382306905 + -1.2 = -4.582306905 x = -4.582306905 Simplifying x = -4.582306905

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.182306905, -4.582306905}

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