(8y^2+4y-9)-(6y+4)=

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Solution for (8y^2+4y-9)-(6y+4)= equation:


Simplifying
(8y2 + 4y + -9) + -1(6y + 4) = 0

Reorder the terms:
(-9 + 4y + 8y2) + -1(6y + 4) = 0

Remove parenthesis around (-9 + 4y + 8y2)
-9 + 4y + 8y2 + -1(6y + 4) = 0

Reorder the terms:
-9 + 4y + 8y2 + -1(4 + 6y) = 0
-9 + 4y + 8y2 + (4 * -1 + 6y * -1) = 0
-9 + 4y + 8y2 + (-4 + -6y) = 0

Reorder the terms:
-9 + -4 + 4y + -6y + 8y2 = 0

Combine like terms: -9 + -4 = -13
-13 + 4y + -6y + 8y2 = 0

Combine like terms: 4y + -6y = -2y
-13 + -2y + 8y2 = 0

Solving
-13 + -2y + 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'.
-1.625 + -0.25y + y2 = 0

Move the constant term to the right:

Add '1.625' to each side of the equation.
-1.625 + -0.25y + 1.625 + y2 = 0 + 1.625

Reorder the terms:
-1.625 + 1.625 + -0.25y + y2 = 0 + 1.625

Combine like terms: -1.625 + 1.625 = 0.000
0.000 + -0.25y + y2 = 0 + 1.625
-0.25y + y2 = 0 + 1.625

Combine like terms: 0 + 1.625 = 1.625
-0.25y + y2 = 1.625

The y term is -0.25y.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25y + 0.015625 + y2 = 1.625 + 0.015625

Reorder the terms:
0.015625 + -0.25y + y2 = 1.625 + 0.015625

Combine like terms: 1.625 + 0.015625 = 1.640625
0.015625 + -0.25y + y2 = 1.640625

Factor a perfect square on the left side:
(y + -0.125)(y + -0.125) = 1.640625

Calculate the square root of the right side: 1.280868846

Break this problem into two subproblems by setting 
(y + -0.125) equal to 1.280868846 and -1.280868846.

Subproblem 1

y + -0.125 = 1.280868846 Simplifying y + -0.125 = 1.280868846 Reorder the terms: -0.125 + y = 1.280868846 Solving -0.125 + y = 1.280868846 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + y = 1.280868846 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + y = 1.280868846 + 0.125 y = 1.280868846 + 0.125 Combine like terms: 1.280868846 + 0.125 = 1.405868846 y = 1.405868846 Simplifying y = 1.405868846

Subproblem 2

y + -0.125 = -1.280868846 Simplifying y + -0.125 = -1.280868846 Reorder the terms: -0.125 + y = -1.280868846 Solving -0.125 + y = -1.280868846 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + y = -1.280868846 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + y = -1.280868846 + 0.125 y = -1.280868846 + 0.125 Combine like terms: -1.280868846 + 0.125 = -1.155868846 y = -1.155868846 Simplifying y = -1.155868846

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.405868846, -1.155868846}

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