6X^2+2X=15

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Solution for 6X^2+2X=15 equation:


Simplifying
6X2 + 2X = 15

Reorder the terms:
2X + 6X2 = 15

Solving
2X + 6X2 = 15

Solving for variable 'X'.

Reorder the terms:
-15 + 2X + 6X2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 2X + 6X2 = 0

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

Divide each side by '6'.
-2.5 + 0.3333333333X + X2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 0.3333333333X + 2.5 + X2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 0.3333333333X + X2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 0.3333333333X + X2 = 0 + 2.5
0.3333333333X + X2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
0.3333333333X + X2 = 2.5

The X term is 0.3333333333X.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333X + 0.02777777779 + X2 = 2.5 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333X + X2 = 2.5 + 0.02777777779

Combine like terms: 2.5 + 0.02777777779 = 2.52777777779
0.02777777779 + 0.3333333333X + X2 = 2.52777777779

Factor a perfect square on the left side:
(X + 0.1666666667)(X + 0.1666666667) = 2.52777777779

Calculate the square root of the right side: 1.589898669

Break this problem into two subproblems by setting 
(X + 0.1666666667) equal to 1.589898669 and -1.589898669.

Subproblem 1

X + 0.1666666667 = 1.589898669 Simplifying X + 0.1666666667 = 1.589898669 Reorder the terms: 0.1666666667 + X = 1.589898669 Solving 0.1666666667 + X = 1.589898669 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + X = 1.589898669 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + X = 1.589898669 + -0.1666666667 X = 1.589898669 + -0.1666666667 Combine like terms: 1.589898669 + -0.1666666667 = 1.4232320023 X = 1.4232320023 Simplifying X = 1.4232320023

Subproblem 2

X + 0.1666666667 = -1.589898669 Simplifying X + 0.1666666667 = -1.589898669 Reorder the terms: 0.1666666667 + X = -1.589898669 Solving 0.1666666667 + X = -1.589898669 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + X = -1.589898669 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + X = -1.589898669 + -0.1666666667 X = -1.589898669 + -0.1666666667 Combine like terms: -1.589898669 + -0.1666666667 = -1.7565653357 X = -1.7565653357 Simplifying X = -1.7565653357

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.4232320023, -1.7565653357}

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