9+3y+2y^2=17

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Solution for 9+3y+2y^2=17 equation:


Simplifying
9 + 3y + 2y2 = 17

Solving
9 + 3y + 2y2 = 17

Solving for variable 'y'.

Reorder the terms:
9 + -17 + 3y + 2y2 = 17 + -17

Combine like terms: 9 + -17 = -8
-8 + 3y + 2y2 = 17 + -17

Combine like terms: 17 + -17 = 0
-8 + 3y + 2y2 = 0

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

Divide each side by '2'.
-4 + 1.5y + y2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 1.5y + 4 + y2 = 0 + 4

Reorder the terms:
-4 + 4 + 1.5y + y2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 1.5y + y2 = 0 + 4
1.5y + y2 = 0 + 4

Combine like terms: 0 + 4 = 4
1.5y + y2 = 4

The y term is 1.5y.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5y + 0.5625 + y2 = 4 + 0.5625

Reorder the terms:
0.5625 + 1.5y + y2 = 4 + 0.5625

Combine like terms: 4 + 0.5625 = 4.5625
0.5625 + 1.5y + y2 = 4.5625

Factor a perfect square on the left side:
(y + 0.75)(y + 0.75) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(y + 0.75) equal to 2.136000936 and -2.136000936.

Subproblem 1

y + 0.75 = 2.136000936 Simplifying y + 0.75 = 2.136000936 Reorder the terms: 0.75 + y = 2.136000936 Solving 0.75 + y = 2.136000936 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + y = 2.136000936 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = 2.136000936 + -0.75 y = 2.136000936 + -0.75 Combine like terms: 2.136000936 + -0.75 = 1.386000936 y = 1.386000936 Simplifying y = 1.386000936

Subproblem 2

y + 0.75 = -2.136000936 Simplifying y + 0.75 = -2.136000936 Reorder the terms: 0.75 + y = -2.136000936 Solving 0.75 + y = -2.136000936 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + y = -2.136000936 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = -2.136000936 + -0.75 y = -2.136000936 + -0.75 Combine like terms: -2.136000936 + -0.75 = -2.886000936 y = -2.886000936 Simplifying y = -2.886000936

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.386000936, -2.886000936}

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