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

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


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

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

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

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

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

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

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

Combine like terms: -5y + -3y = -8y
-1 + -8y + 7y2 + 4y2 = 0

Combine like terms: 7y2 + 4y2 = 11y2
-1 + -8y + 11y2 = 0

Solving
-1 + -8y + 11y2 = 0

Solving for variable 'y'.

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

Divide each side by '11'.
-0.09090909091 + -0.7272727273y + y2 = 0

Move the constant term to the right:

Add '0.09090909091' to each side of the equation.
-0.09090909091 + -0.7272727273y + 0.09090909091 + y2 = 0 + 0.09090909091

Reorder the terms:
-0.09090909091 + 0.09090909091 + -0.7272727273y + y2 = 0 + 0.09090909091

Combine like terms: -0.09090909091 + 0.09090909091 = 0.00000000000
0.00000000000 + -0.7272727273y + y2 = 0 + 0.09090909091
-0.7272727273y + y2 = 0 + 0.09090909091

Combine like terms: 0 + 0.09090909091 = 0.09090909091
-0.7272727273y + y2 = 0.09090909091

The y term is -0.7272727273y.  Take half its coefficient (-0.3636363637).
Square it (0.1322314050) and add it to both sides.

Add '0.1322314050' to each side of the equation.
-0.7272727273y + 0.1322314050 + y2 = 0.09090909091 + 0.1322314050

Reorder the terms:
0.1322314050 + -0.7272727273y + y2 = 0.09090909091 + 0.1322314050

Combine like terms: 0.09090909091 + 0.1322314050 = 0.22314049591
0.1322314050 + -0.7272727273y + y2 = 0.22314049591

Factor a perfect square on the left side:
(y + -0.3636363637)(y + -0.3636363637) = 0.22314049591

Calculate the square root of the right side: 0.472377493

Break this problem into two subproblems by setting 
(y + -0.3636363637) equal to 0.472377493 and -0.472377493.

Subproblem 1

y + -0.3636363637 = 0.472377493 Simplifying y + -0.3636363637 = 0.472377493 Reorder the terms: -0.3636363637 + y = 0.472377493 Solving -0.3636363637 + y = 0.472377493 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3636363637' to each side of the equation. -0.3636363637 + 0.3636363637 + y = 0.472377493 + 0.3636363637 Combine like terms: -0.3636363637 + 0.3636363637 = 0.0000000000 0.0000000000 + y = 0.472377493 + 0.3636363637 y = 0.472377493 + 0.3636363637 Combine like terms: 0.472377493 + 0.3636363637 = 0.8360138567 y = 0.8360138567 Simplifying y = 0.8360138567

Subproblem 2

y + -0.3636363637 = -0.472377493 Simplifying y + -0.3636363637 = -0.472377493 Reorder the terms: -0.3636363637 + y = -0.472377493 Solving -0.3636363637 + y = -0.472377493 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3636363637' to each side of the equation. -0.3636363637 + 0.3636363637 + y = -0.472377493 + 0.3636363637 Combine like terms: -0.3636363637 + 0.3636363637 = 0.0000000000 0.0000000000 + y = -0.472377493 + 0.3636363637 y = -0.472377493 + 0.3636363637 Combine like terms: -0.472377493 + 0.3636363637 = -0.1087411293 y = -0.1087411293 Simplifying y = -0.1087411293

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.8360138567, -0.1087411293}

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