(5y^2-2y-4)+(3y^2-7y+1)=

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Solution for (5y^2-2y-4)+(3y^2-7y+1)= equation:


Simplifying
(5y2 + -2y + -4) + (3y2 + -7y + 1) = 0

Reorder the terms:
(-4 + -2y + 5y2) + (3y2 + -7y + 1) = 0

Remove parenthesis around (-4 + -2y + 5y2)
-4 + -2y + 5y2 + (3y2 + -7y + 1) = 0

Reorder the terms:
-4 + -2y + 5y2 + (1 + -7y + 3y2) = 0

Remove parenthesis around (1 + -7y + 3y2)
-4 + -2y + 5y2 + 1 + -7y + 3y2 = 0

Reorder the terms:
-4 + 1 + -2y + -7y + 5y2 + 3y2 = 0

Combine like terms: -4 + 1 = -3
-3 + -2y + -7y + 5y2 + 3y2 = 0

Combine like terms: -2y + -7y = -9y
-3 + -9y + 5y2 + 3y2 = 0

Combine like terms: 5y2 + 3y2 = 8y2
-3 + -9y + 8y2 = 0

Solving
-3 + -9y + 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 + -1.125y + y2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -1.125y + 0.375 + y2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -1.125y + y2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -1.125y + y2 = 0 + 0.375
-1.125y + y2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-1.125y + y2 = 0.375

The y term is -1.125y.  Take half its coefficient (-0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
-1.125y + 0.31640625 + y2 = 0.375 + 0.31640625

Reorder the terms:
0.31640625 + -1.125y + y2 = 0.375 + 0.31640625

Combine like terms: 0.375 + 0.31640625 = 0.69140625
0.31640625 + -1.125y + y2 = 0.69140625

Factor a perfect square on the left side:
(y + -0.5625)(y + -0.5625) = 0.69140625

Calculate the square root of the right side: 0.831508418

Break this problem into two subproblems by setting 
(y + -0.5625) equal to 0.831508418 and -0.831508418.

Subproblem 1

y + -0.5625 = 0.831508418 Simplifying y + -0.5625 = 0.831508418 Reorder the terms: -0.5625 + y = 0.831508418 Solving -0.5625 + y = 0.831508418 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + y = 0.831508418 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + y = 0.831508418 + 0.5625 y = 0.831508418 + 0.5625 Combine like terms: 0.831508418 + 0.5625 = 1.394008418 y = 1.394008418 Simplifying y = 1.394008418

Subproblem 2

y + -0.5625 = -0.831508418 Simplifying y + -0.5625 = -0.831508418 Reorder the terms: -0.5625 + y = -0.831508418 Solving -0.5625 + y = -0.831508418 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + y = -0.831508418 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + y = -0.831508418 + 0.5625 y = -0.831508418 + 0.5625 Combine like terms: -0.831508418 + 0.5625 = -0.269008418 y = -0.269008418 Simplifying y = -0.269008418

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.394008418, -0.269008418}

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