(3y^2-2y+1)+(5y^2-y-4)=

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Solution for (3y^2-2y+1)+(5y^2-y-4)= equation:


Simplifying
(3y2 + -2y + 1) + (5y2 + -1y + -4) = 0

Reorder the terms:
(1 + -2y + 3y2) + (5y2 + -1y + -4) = 0

Remove parenthesis around (1 + -2y + 3y2)
1 + -2y + 3y2 + (5y2 + -1y + -4) = 0

Reorder the terms:
1 + -2y + 3y2 + (-4 + -1y + 5y2) = 0

Remove parenthesis around (-4 + -1y + 5y2)
1 + -2y + 3y2 + -4 + -1y + 5y2 = 0

Reorder the terms:
1 + -4 + -2y + -1y + 3y2 + 5y2 = 0

Combine like terms: 1 + -4 = -3
-3 + -2y + -1y + 3y2 + 5y2 = 0

Combine like terms: -2y + -1y = -3y
-3 + -3y + 3y2 + 5y2 = 0

Combine like terms: 3y2 + 5y2 = 8y2
-3 + -3y + 8y2 = 0

Solving
-3 + -3y + 8y2 = 0

Solving for variable 'y'.

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

Divide each side by '8'.
-0.375 + -0.375y + y2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -0.375y + 0.375 + y2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -0.375y + y2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -0.375y + y2 = 0 + 0.375
-0.375y + y2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-0.375y + y2 = 0.375

The y term is -0.375y.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375y + 0.03515625 + y2 = 0.375 + 0.03515625

Reorder the terms:
0.03515625 + -0.375y + y2 = 0.375 + 0.03515625

Combine like terms: 0.375 + 0.03515625 = 0.41015625
0.03515625 + -0.375y + y2 = 0.41015625

Factor a perfect square on the left side:
(y + -0.1875)(y + -0.1875) = 0.41015625

Calculate the square root of the right side: 0.640434423

Break this problem into two subproblems by setting 
(y + -0.1875) equal to 0.640434423 and -0.640434423.

Subproblem 1

y + -0.1875 = 0.640434423 Simplifying y + -0.1875 = 0.640434423 Reorder the terms: -0.1875 + y = 0.640434423 Solving -0.1875 + y = 0.640434423 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + y = 0.640434423 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + y = 0.640434423 + 0.1875 y = 0.640434423 + 0.1875 Combine like terms: 0.640434423 + 0.1875 = 0.827934423 y = 0.827934423 Simplifying y = 0.827934423

Subproblem 2

y + -0.1875 = -0.640434423 Simplifying y + -0.1875 = -0.640434423 Reorder the terms: -0.1875 + y = -0.640434423 Solving -0.1875 + y = -0.640434423 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + y = -0.640434423 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + y = -0.640434423 + 0.1875 y = -0.640434423 + 0.1875 Combine like terms: -0.640434423 + 0.1875 = -0.452934423 y = -0.452934423 Simplifying y = -0.452934423

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.827934423, -0.452934423}

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