4y+5-4.2-5y^2+2=

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Solution for 4y+5-4.2-5y^2+2= equation:


Simplifying
4y + 5 + -4.2 + -5y2 + 2 = 0

Reorder the terms:
5 + -4.2 + 2 + 4y + -5y2 = 0

Combine like terms: 5 + -4.2 = 0.8
0.8 + 2 + 4y + -5y2 = 0

Combine like terms: 0.8 + 2 = 2.8
2.8 + 4y + -5y2 = 0

Solving
2.8 + 4y + -5y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.56 + -0.8y + y2 = 0

Move the constant term to the right:

Add '0.56' to each side of the equation.
-0.56 + -0.8y + 0.56 + y2 = 0 + 0.56

Reorder the terms:
-0.56 + 0.56 + -0.8y + y2 = 0 + 0.56

Combine like terms: -0.56 + 0.56 = 0.00
0.00 + -0.8y + y2 = 0 + 0.56
-0.8y + y2 = 0 + 0.56

Combine like terms: 0 + 0.56 = 0.56
-0.8y + y2 = 0.56

The y term is -0.8y.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8y + 0.16 + y2 = 0.56 + 0.16

Reorder the terms:
0.16 + -0.8y + y2 = 0.56 + 0.16

Combine like terms: 0.56 + 0.16 = 0.72
0.16 + -0.8y + y2 = 0.72

Factor a perfect square on the left side:
(y + -0.4)(y + -0.4) = 0.72

Calculate the square root of the right side: 0.848528137

Break this problem into two subproblems by setting 
(y + -0.4) equal to 0.848528137 and -0.848528137.

Subproblem 1

y + -0.4 = 0.848528137 Simplifying y + -0.4 = 0.848528137 Reorder the terms: -0.4 + y = 0.848528137 Solving -0.4 + y = 0.848528137 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + y = 0.848528137 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + y = 0.848528137 + 0.4 y = 0.848528137 + 0.4 Combine like terms: 0.848528137 + 0.4 = 1.248528137 y = 1.248528137 Simplifying y = 1.248528137

Subproblem 2

y + -0.4 = -0.848528137 Simplifying y + -0.4 = -0.848528137 Reorder the terms: -0.4 + y = -0.848528137 Solving -0.4 + y = -0.848528137 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + y = -0.848528137 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + y = -0.848528137 + 0.4 y = -0.848528137 + 0.4 Combine like terms: -0.848528137 + 0.4 = -0.448528137 y = -0.448528137 Simplifying y = -0.448528137

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.248528137, -0.448528137}

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