0=y^2+6y-100

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Solution for 0=y^2+6y-100 equation:


Simplifying
0 = y2 + 6y + -100

Reorder the terms:
0 = -100 + 6y + y2

Solving
0 = -100 + 6y + y2

Solving for variable 'y'.

Combine like terms: 0 + 100 = 100
100 + -6y + -1y2 = -100 + 6y + y2 + 100 + -6y + -1y2

Reorder the terms:
100 + -6y + -1y2 = -100 + 100 + 6y + -6y + y2 + -1y2

Combine like terms: -100 + 100 = 0
100 + -6y + -1y2 = 0 + 6y + -6y + y2 + -1y2
100 + -6y + -1y2 = 6y + -6y + y2 + -1y2

Combine like terms: 6y + -6y = 0
100 + -6y + -1y2 = 0 + y2 + -1y2
100 + -6y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
100 + -6y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-100 + 6y + y2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 6y + 100 + y2 = 0 + 100

Reorder the terms:
-100 + 100 + 6y + y2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 6y + y2 = 0 + 100
6y + y2 = 0 + 100

Combine like terms: 0 + 100 = 100
6y + y2 = 100

The y term is 6y.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6y + 9 + y2 = 100 + 9

Reorder the terms:
9 + 6y + y2 = 100 + 9

Combine like terms: 100 + 9 = 109
9 + 6y + y2 = 109

Factor a perfect square on the left side:
(y + 3)(y + 3) = 109

Calculate the square root of the right side: 10.440306509

Break this problem into two subproblems by setting 
(y + 3) equal to 10.440306509 and -10.440306509.

Subproblem 1

y + 3 = 10.440306509 Simplifying y + 3 = 10.440306509 Reorder the terms: 3 + y = 10.440306509 Solving 3 + y = 10.440306509 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = 10.440306509 + -3 Combine like terms: 3 + -3 = 0 0 + y = 10.440306509 + -3 y = 10.440306509 + -3 Combine like terms: 10.440306509 + -3 = 7.440306509 y = 7.440306509 Simplifying y = 7.440306509

Subproblem 2

y + 3 = -10.440306509 Simplifying y + 3 = -10.440306509 Reorder the terms: 3 + y = -10.440306509 Solving 3 + y = -10.440306509 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = -10.440306509 + -3 Combine like terms: 3 + -3 = 0 0 + y = -10.440306509 + -3 y = -10.440306509 + -3 Combine like terms: -10.440306509 + -3 = -13.440306509 y = -13.440306509 Simplifying y = -13.440306509

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.440306509, -13.440306509}

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