13y^2+17y+12=6y^2+2y+5

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Solution for 13y^2+17y+12=6y^2+2y+5 equation:


Simplifying
13y2 + 17y + 12 = 6y2 + 2y + 5

Reorder the terms:
12 + 17y + 13y2 = 6y2 + 2y + 5

Reorder the terms:
12 + 17y + 13y2 = 5 + 2y + 6y2

Solving
12 + 17y + 13y2 = 5 + 2y + 6y2

Solving for variable 'y'.

Reorder the terms:
12 + -5 + 17y + -2y + 13y2 + -6y2 = 5 + 2y + 6y2 + -5 + -2y + -6y2

Combine like terms: 12 + -5 = 7
7 + 17y + -2y + 13y2 + -6y2 = 5 + 2y + 6y2 + -5 + -2y + -6y2

Combine like terms: 17y + -2y = 15y
7 + 15y + 13y2 + -6y2 = 5 + 2y + 6y2 + -5 + -2y + -6y2

Combine like terms: 13y2 + -6y2 = 7y2
7 + 15y + 7y2 = 5 + 2y + 6y2 + -5 + -2y + -6y2

Reorder the terms:
7 + 15y + 7y2 = 5 + -5 + 2y + -2y + 6y2 + -6y2

Combine like terms: 5 + -5 = 0
7 + 15y + 7y2 = 0 + 2y + -2y + 6y2 + -6y2
7 + 15y + 7y2 = 2y + -2y + 6y2 + -6y2

Combine like terms: 2y + -2y = 0
7 + 15y + 7y2 = 0 + 6y2 + -6y2
7 + 15y + 7y2 = 6y2 + -6y2

Combine like terms: 6y2 + -6y2 = 0
7 + 15y + 7y2 = 0

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

Divide each side by '7'.
1 + 2.142857143y + y2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 2.142857143y + -1 + y2 = 0 + -1

Reorder the terms:
1 + -1 + 2.142857143y + y2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 2.142857143y + y2 = 0 + -1
2.142857143y + y2 = 0 + -1

Combine like terms: 0 + -1 = -1
2.142857143y + y2 = -1

The y term is 2.142857143y.  Take half its coefficient (1.071428572).
Square it (1.147959185) and add it to both sides.

Add '1.147959185' to each side of the equation.
2.142857143y + 1.147959185 + y2 = -1 + 1.147959185

Reorder the terms:
1.147959185 + 2.142857143y + y2 = -1 + 1.147959185

Combine like terms: -1 + 1.147959185 = 0.147959185
1.147959185 + 2.142857143y + y2 = 0.147959185

Factor a perfect square on the left side:
(y + 1.071428572)(y + 1.071428572) = 0.147959185

Calculate the square root of the right side: 0.384654631

Break this problem into two subproblems by setting 
(y + 1.071428572) equal to 0.384654631 and -0.384654631.

Subproblem 1

y + 1.071428572 = 0.384654631 Simplifying y + 1.071428572 = 0.384654631 Reorder the terms: 1.071428572 + y = 0.384654631 Solving 1.071428572 + y = 0.384654631 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.071428572' to each side of the equation. 1.071428572 + -1.071428572 + y = 0.384654631 + -1.071428572 Combine like terms: 1.071428572 + -1.071428572 = 0.000000000 0.000000000 + y = 0.384654631 + -1.071428572 y = 0.384654631 + -1.071428572 Combine like terms: 0.384654631 + -1.071428572 = -0.686773941 y = -0.686773941 Simplifying y = -0.686773941

Subproblem 2

y + 1.071428572 = -0.384654631 Simplifying y + 1.071428572 = -0.384654631 Reorder the terms: 1.071428572 + y = -0.384654631 Solving 1.071428572 + y = -0.384654631 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.071428572' to each side of the equation. 1.071428572 + -1.071428572 + y = -0.384654631 + -1.071428572 Combine like terms: 1.071428572 + -1.071428572 = 0.000000000 0.000000000 + y = -0.384654631 + -1.071428572 y = -0.384654631 + -1.071428572 Combine like terms: -0.384654631 + -1.071428572 = -1.456083203 y = -1.456083203 Simplifying y = -1.456083203

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.686773941, -1.456083203}

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