y^2+10y+25=85

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Solution for y^2+10y+25=85 equation:


Simplifying
y2 + 10y + 25 = 85

Reorder the terms:
25 + 10y + y2 = 85

Solving
25 + 10y + y2 = 85

Solving for variable 'y'.

Reorder the terms:
25 + -85 + 10y + y2 = 85 + -85

Combine like terms: 25 + -85 = -60
-60 + 10y + y2 = 85 + -85

Combine like terms: 85 + -85 = 0
-60 + 10y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 10y + 60 + y2 = 0 + 60

Reorder the terms:
-60 + 60 + 10y + y2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 10y + y2 = 0 + 60
10y + y2 = 0 + 60

Combine like terms: 0 + 60 = 60
10y + y2 = 60

The y term is 10y.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10y + 25 + y2 = 60 + 25

Reorder the terms:
25 + 10y + y2 = 60 + 25

Combine like terms: 60 + 25 = 85
25 + 10y + y2 = 85

Factor a perfect square on the left side:
(y + 5)(y + 5) = 85

Calculate the square root of the right side: 9.219544457

Break this problem into two subproblems by setting 
(y + 5) equal to 9.219544457 and -9.219544457.

Subproblem 1

y + 5 = 9.219544457 Simplifying y + 5 = 9.219544457 Reorder the terms: 5 + y = 9.219544457 Solving 5 + y = 9.219544457 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = 9.219544457 + -5 Combine like terms: 5 + -5 = 0 0 + y = 9.219544457 + -5 y = 9.219544457 + -5 Combine like terms: 9.219544457 + -5 = 4.219544457 y = 4.219544457 Simplifying y = 4.219544457

Subproblem 2

y + 5 = -9.219544457 Simplifying y + 5 = -9.219544457 Reorder the terms: 5 + y = -9.219544457 Solving 5 + y = -9.219544457 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = -9.219544457 + -5 Combine like terms: 5 + -5 = 0 0 + y = -9.219544457 + -5 y = -9.219544457 + -5 Combine like terms: -9.219544457 + -5 = -14.219544457 y = -14.219544457 Simplifying y = -14.219544457

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.219544457, -14.219544457}

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