0.2y^2-2=-0.3y

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Solution for 0.2y^2-2=-0.3y equation:


Simplifying
0.2y2 + -2 = -0.3y

Reorder the terms:
-2 + 0.2y2 = -0.3y

Solving
-2 + 0.2y2 = -0.3y

Solving for variable 'y'.

Reorder the terms:
-2 + 0.3y + 0.2y2 = -0.3y + 0.3y

Combine like terms: -0.3y + 0.3y = 0.0
-2 + 0.3y + 0.2y2 = 0.0

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

Divide each side by '0.2'.
-10 + 1.5y + y2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 1.5y + 10 + y2 = 0 + 10

Reorder the terms:
-10 + 10 + 1.5y + y2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 1.5y + y2 = 0 + 10
1.5y + y2 = 0 + 10

Combine like terms: 0 + 10 = 10
1.5y + y2 = 10

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 = 10 + 0.5625

Reorder the terms:
0.5625 + 1.5y + y2 = 10 + 0.5625

Combine like terms: 10 + 0.5625 = 10.5625
0.5625 + 1.5y + y2 = 10.5625

Factor a perfect square on the left side:
(y + 0.75)(y + 0.75) = 10.5625

Calculate the square root of the right side: 3.25

Break this problem into two subproblems by setting 
(y + 0.75) equal to 3.25 and -3.25.

Subproblem 1

y + 0.75 = 3.25 Simplifying y + 0.75 = 3.25 Reorder the terms: 0.75 + y = 3.25 Solving 0.75 + y = 3.25 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 = 3.25 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = 3.25 + -0.75 y = 3.25 + -0.75 Combine like terms: 3.25 + -0.75 = 2.5 y = 2.5 Simplifying y = 2.5

Subproblem 2

y + 0.75 = -3.25 Simplifying y + 0.75 = -3.25 Reorder the terms: 0.75 + y = -3.25 Solving 0.75 + y = -3.25 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 = -3.25 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = -3.25 + -0.75 y = -3.25 + -0.75 Combine like terms: -3.25 + -0.75 = -4 y = -4 Simplifying y = -4

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.5, -4}

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