5y^2-4y+4=11

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Solution for 5y^2-4y+4=11 equation:


Simplifying
5y2 + -4y + 4 = 11

Reorder the terms:
4 + -4y + 5y2 = 11

Solving
4 + -4y + 5y2 = 11

Solving for variable 'y'.

Reorder the terms:
4 + -11 + -4y + 5y2 = 11 + -11

Combine like terms: 4 + -11 = -7
-7 + -4y + 5y2 = 11 + -11

Combine like terms: 11 + -11 = 0
-7 + -4y + 5y2 = 0

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

Divide each side by '5'.
-1.4 + -0.8y + y2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + -0.8y + 1.4 + y2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + -0.8y + y2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + -0.8y + y2 = 0 + 1.4
-0.8y + y2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
-0.8y + y2 = 1.4

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 = 1.4 + 0.16

Reorder the terms:
0.16 + -0.8y + y2 = 1.4 + 0.16

Combine like terms: 1.4 + 0.16 = 1.56
0.16 + -0.8y + y2 = 1.56

Factor a perfect square on the left side:
(y + -0.4)(y + -0.4) = 1.56

Calculate the square root of the right side: 1.2489996

Break this problem into two subproblems by setting 
(y + -0.4) equal to 1.2489996 and -1.2489996.

Subproblem 1

y + -0.4 = 1.2489996 Simplifying y + -0.4 = 1.2489996 Reorder the terms: -0.4 + y = 1.2489996 Solving -0.4 + y = 1.2489996 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 = 1.2489996 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + y = 1.2489996 + 0.4 y = 1.2489996 + 0.4 Combine like terms: 1.2489996 + 0.4 = 1.6489996 y = 1.6489996 Simplifying y = 1.6489996

Subproblem 2

y + -0.4 = -1.2489996 Simplifying y + -0.4 = -1.2489996 Reorder the terms: -0.4 + y = -1.2489996 Solving -0.4 + y = -1.2489996 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 = -1.2489996 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + y = -1.2489996 + 0.4 y = -1.2489996 + 0.4 Combine like terms: -1.2489996 + 0.4 = -0.8489996 y = -0.8489996 Simplifying y = -0.8489996

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.6489996, -0.8489996}

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