2y^2+4.5y-6=0

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Solution for 2y^2+4.5y-6=0 equation:


Simplifying
2y2 + 4.5y + -6 = 0

Reorder the terms:
-6 + 4.5y + 2y2 = 0

Solving
-6 + 4.5y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-3 + 2.25y + y2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 2.25y + 3 + y2 = 0 + 3

Reorder the terms:
-3 + 3 + 2.25y + y2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 2.25y + y2 = 0 + 3
2.25y + y2 = 0 + 3

Combine like terms: 0 + 3 = 3
2.25y + y2 = 3

The y term is 2.25y.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25y + 1.265625 + y2 = 3 + 1.265625

Reorder the terms:
1.265625 + 2.25y + y2 = 3 + 1.265625

Combine like terms: 3 + 1.265625 = 4.265625
1.265625 + 2.25y + y2 = 4.265625

Factor a perfect square on the left side:
(y + 1.125)(y + 1.125) = 4.265625

Calculate the square root of the right side: 2.065338955

Break this problem into two subproblems by setting 
(y + 1.125) equal to 2.065338955 and -2.065338955.

Subproblem 1

y + 1.125 = 2.065338955 Simplifying y + 1.125 = 2.065338955 Reorder the terms: 1.125 + y = 2.065338955 Solving 1.125 + y = 2.065338955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + y = 2.065338955 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + y = 2.065338955 + -1.125 y = 2.065338955 + -1.125 Combine like terms: 2.065338955 + -1.125 = 0.940338955 y = 0.940338955 Simplifying y = 0.940338955

Subproblem 2

y + 1.125 = -2.065338955 Simplifying y + 1.125 = -2.065338955 Reorder the terms: 1.125 + y = -2.065338955 Solving 1.125 + y = -2.065338955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + y = -2.065338955 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + y = -2.065338955 + -1.125 y = -2.065338955 + -1.125 Combine like terms: -2.065338955 + -1.125 = -3.190338955 y = -3.190338955 Simplifying y = -3.190338955

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.940338955, -3.190338955}

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