(y^2-2y+4)+(-6y^2+5y+7)=

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Solution for (y^2-2y+4)+(-6y^2+5y+7)= equation:


Simplifying
(y2 + -2y + 4) + (-6y2 + 5y + 7) = 0

Reorder the terms:
(4 + -2y + y2) + (-6y2 + 5y + 7) = 0

Remove parenthesis around (4 + -2y + y2)
4 + -2y + y2 + (-6y2 + 5y + 7) = 0

Reorder the terms:
4 + -2y + y2 + (7 + 5y + -6y2) = 0

Remove parenthesis around (7 + 5y + -6y2)
4 + -2y + y2 + 7 + 5y + -6y2 = 0

Reorder the terms:
4 + 7 + -2y + 5y + y2 + -6y2 = 0

Combine like terms: 4 + 7 = 11
11 + -2y + 5y + y2 + -6y2 = 0

Combine like terms: -2y + 5y = 3y
11 + 3y + y2 + -6y2 = 0

Combine like terms: y2 + -6y2 = -5y2
11 + 3y + -5y2 = 0

Solving
11 + 3y + -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'.
-2.2 + -0.6y + y2 = 0

Move the constant term to the right:

Add '2.2' to each side of the equation.
-2.2 + -0.6y + 2.2 + y2 = 0 + 2.2

Reorder the terms:
-2.2 + 2.2 + -0.6y + y2 = 0 + 2.2

Combine like terms: -2.2 + 2.2 = 0.0
0.0 + -0.6y + y2 = 0 + 2.2
-0.6y + y2 = 0 + 2.2

Combine like terms: 0 + 2.2 = 2.2
-0.6y + y2 = 2.2

The y term is -0.6y.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6y + 0.09 + y2 = 2.2 + 0.09

Reorder the terms:
0.09 + -0.6y + y2 = 2.2 + 0.09

Combine like terms: 2.2 + 0.09 = 2.29
0.09 + -0.6y + y2 = 2.29

Factor a perfect square on the left side:
(y + -0.3)(y + -0.3) = 2.29

Calculate the square root of the right side: 1.513274595

Break this problem into two subproblems by setting 
(y + -0.3) equal to 1.513274595 and -1.513274595.

Subproblem 1

y + -0.3 = 1.513274595 Simplifying y + -0.3 = 1.513274595 Reorder the terms: -0.3 + y = 1.513274595 Solving -0.3 + y = 1.513274595 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + y = 1.513274595 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + y = 1.513274595 + 0.3 y = 1.513274595 + 0.3 Combine like terms: 1.513274595 + 0.3 = 1.813274595 y = 1.813274595 Simplifying y = 1.813274595

Subproblem 2

y + -0.3 = -1.513274595 Simplifying y + -0.3 = -1.513274595 Reorder the terms: -0.3 + y = -1.513274595 Solving -0.3 + y = -1.513274595 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + y = -1.513274595 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + y = -1.513274595 + 0.3 y = -1.513274595 + 0.3 Combine like terms: -1.513274595 + 0.3 = -1.213274595 y = -1.213274595 Simplifying y = -1.213274595

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.813274595, -1.213274595}

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