3y^2+18y-25=-3

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Solution for 3y^2+18y-25=-3 equation:


Simplifying
3y2 + 18y + -25 = -3

Reorder the terms:
-25 + 18y + 3y2 = -3

Solving
-25 + 18y + 3y2 = -3

Solving for variable 'y'.

Reorder the terms:
-25 + 3 + 18y + 3y2 = -3 + 3

Combine like terms: -25 + 3 = -22
-22 + 18y + 3y2 = -3 + 3

Combine like terms: -3 + 3 = 0
-22 + 18y + 3y2 = 0

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

Divide each side by '3'.
-7.333333333 + 6y + y2 = 0

Move the constant term to the right:

Add '7.333333333' to each side of the equation.
-7.333333333 + 6y + 7.333333333 + y2 = 0 + 7.333333333

Reorder the terms:
-7.333333333 + 7.333333333 + 6y + y2 = 0 + 7.333333333

Combine like terms: -7.333333333 + 7.333333333 = 0.000000000
0.000000000 + 6y + y2 = 0 + 7.333333333
6y + y2 = 0 + 7.333333333

Combine like terms: 0 + 7.333333333 = 7.333333333
6y + y2 = 7.333333333

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 = 7.333333333 + 9

Reorder the terms:
9 + 6y + y2 = 7.333333333 + 9

Combine like terms: 7.333333333 + 9 = 16.333333333
9 + 6y + y2 = 16.333333333

Factor a perfect square on the left side:
(y + 3)(y + 3) = 16.333333333

Calculate the square root of the right side: 4.041451884

Break this problem into two subproblems by setting 
(y + 3) equal to 4.041451884 and -4.041451884.

Subproblem 1

y + 3 = 4.041451884 Simplifying y + 3 = 4.041451884 Reorder the terms: 3 + y = 4.041451884 Solving 3 + y = 4.041451884 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 = 4.041451884 + -3 Combine like terms: 3 + -3 = 0 0 + y = 4.041451884 + -3 y = 4.041451884 + -3 Combine like terms: 4.041451884 + -3 = 1.041451884 y = 1.041451884 Simplifying y = 1.041451884

Subproblem 2

y + 3 = -4.041451884 Simplifying y + 3 = -4.041451884 Reorder the terms: 3 + y = -4.041451884 Solving 3 + y = -4.041451884 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 = -4.041451884 + -3 Combine like terms: 3 + -3 = 0 0 + y = -4.041451884 + -3 y = -4.041451884 + -3 Combine like terms: -4.041451884 + -3 = -7.041451884 y = -7.041451884 Simplifying y = -7.041451884

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.041451884, -7.041451884}

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