6x^2+x-15=8

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Solution for 6x^2+x-15=8 equation:


Simplifying
6x2 + x + -15 = 8

Reorder the terms:
-15 + x + 6x2 = 8

Solving
-15 + x + 6x2 = 8

Solving for variable 'x'.

Reorder the terms:
-15 + -8 + x + 6x2 = 8 + -8

Combine like terms: -15 + -8 = -23
-23 + x + 6x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-23 + x + 6x2 = 0

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

Divide each side by '6'.
-3.833333333 + 0.1666666667x + x2 = 0

Move the constant term to the right:

Add '3.833333333' to each side of the equation.
-3.833333333 + 0.1666666667x + 3.833333333 + x2 = 0 + 3.833333333

Reorder the terms:
-3.833333333 + 3.833333333 + 0.1666666667x + x2 = 0 + 3.833333333

Combine like terms: -3.833333333 + 3.833333333 = 0.000000000
0.000000000 + 0.1666666667x + x2 = 0 + 3.833333333
0.1666666667x + x2 = 0 + 3.833333333

Combine like terms: 0 + 3.833333333 = 3.833333333
0.1666666667x + x2 = 3.833333333

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.1666666667x + 0.25 + x2 = 3.833333333 + 0.25

Reorder the terms:
0.25 + 0.1666666667x + x2 = 3.833333333 + 0.25

Combine like terms: 3.833333333 + 0.25 = 4.083333333
0.25 + 0.1666666667x + x2 = 4.083333333

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 4.083333333

Calculate the square root of the right side: 2.020725942

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.020725942 and -2.020725942.

Subproblem 1

x + 0.5 = 2.020725942 Simplifying x + 0.5 = 2.020725942 Reorder the terms: 0.5 + x = 2.020725942 Solving 0.5 + x = 2.020725942 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.020725942 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.020725942 + -0.5 x = 2.020725942 + -0.5 Combine like terms: 2.020725942 + -0.5 = 1.520725942 x = 1.520725942 Simplifying x = 1.520725942

Subproblem 2

x + 0.5 = -2.020725942 Simplifying x + 0.5 = -2.020725942 Reorder the terms: 0.5 + x = -2.020725942 Solving 0.5 + x = -2.020725942 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.020725942 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.020725942 + -0.5 x = -2.020725942 + -0.5 Combine like terms: -2.020725942 + -0.5 = -2.520725942 x = -2.520725942 Simplifying x = -2.520725942

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.520725942, -2.520725942}

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