8y^2+20y+13=y^2+5y+6

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Solution for 8y^2+20y+13=y^2+5y+6 equation:


Simplifying
8y2 + 20y + 13 = y2 + 5y + 6

Reorder the terms:
13 + 20y + 8y2 = y2 + 5y + 6

Reorder the terms:
13 + 20y + 8y2 = 6 + 5y + y2

Solving
13 + 20y + 8y2 = 6 + 5y + y2

Solving for variable 'y'.

Reorder the terms:
13 + -6 + 20y + -5y + 8y2 + -1y2 = 6 + 5y + y2 + -6 + -5y + -1y2

Combine like terms: 13 + -6 = 7
7 + 20y + -5y + 8y2 + -1y2 = 6 + 5y + y2 + -6 + -5y + -1y2

Combine like terms: 20y + -5y = 15y
7 + 15y + 8y2 + -1y2 = 6 + 5y + y2 + -6 + -5y + -1y2

Combine like terms: 8y2 + -1y2 = 7y2
7 + 15y + 7y2 = 6 + 5y + y2 + -6 + -5y + -1y2

Reorder the terms:
7 + 15y + 7y2 = 6 + -6 + 5y + -5y + y2 + -1y2

Combine like terms: 6 + -6 = 0
7 + 15y + 7y2 = 0 + 5y + -5y + y2 + -1y2
7 + 15y + 7y2 = 5y + -5y + y2 + -1y2

Combine like terms: 5y + -5y = 0
7 + 15y + 7y2 = 0 + y2 + -1y2
7 + 15y + 7y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 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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