4y^2-(4-2y-2y-y^2)=11

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Solution for 4y^2-(4-2y-2y-y^2)=11 equation:


Simplifying
4y2 + -1(4 + -2y + -2y + -1y2) = 11

Combine like terms: -2y + -2y = -4y
4y2 + -1(4 + -4y + -1y2) = 11
4y2 + (4 * -1 + -4y * -1 + -1y2 * -1) = 11
4y2 + (-4 + 4y + 1y2) = 11

Reorder the terms:
-4 + 4y + 4y2 + 1y2 = 11

Combine like terms: 4y2 + 1y2 = 5y2
-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 = -15
-15 + 4y + 5y2 = 11 + -11

Combine like terms: 11 + -11 = 0
-15 + 4y + 5y2 = 0

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

Divide each side by '5'.
-3 + 0.8y + y2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 0.8y + 3 + y2 = 0 + 3

Reorder the terms:
-3 + 3 + 0.8y + y2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 0.8y + y2 = 0 + 3
0.8y + y2 = 0 + 3

Combine like terms: 0 + 3 = 3
0.8y + y2 = 3

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 = 3 + 0.16

Reorder the terms:
0.16 + 0.8y + y2 = 3 + 0.16

Combine like terms: 3 + 0.16 = 3.16
0.16 + 0.8y + y2 = 3.16

Factor a perfect square on the left side:
(y + 0.4)(y + 0.4) = 3.16

Calculate the square root of the right side: 1.777638883

Break this problem into two subproblems by setting 
(y + 0.4) equal to 1.777638883 and -1.777638883.

Subproblem 1

y + 0.4 = 1.777638883 Simplifying y + 0.4 = 1.777638883 Reorder the terms: 0.4 + y = 1.777638883 Solving 0.4 + y = 1.777638883 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 = 1.777638883 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + y = 1.777638883 + -0.4 y = 1.777638883 + -0.4 Combine like terms: 1.777638883 + -0.4 = 1.377638883 y = 1.377638883 Simplifying y = 1.377638883

Subproblem 2

y + 0.4 = -1.777638883 Simplifying y + 0.4 = -1.777638883 Reorder the terms: 0.4 + y = -1.777638883 Solving 0.4 + y = -1.777638883 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 = -1.777638883 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + y = -1.777638883 + -0.4 y = -1.777638883 + -0.4 Combine like terms: -1.777638883 + -0.4 = -2.177638883 y = -2.177638883 Simplifying y = -2.177638883

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.377638883, -2.177638883}

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