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

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


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

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

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

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

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

Combine like terms: -8 + -4 = -12
-12 + 6y + 9y + 4y2 = 0

Combine like terms: 6y + 9y = 15y
-12 + 15y + 4y2 = 0

Solving
-12 + 15y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
-3 + 3.75y + y2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 3.75y + 3 + y2 = 0 + 3

Reorder the terms:
-3 + 3 + 3.75y + y2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 3.75y + y2 = 0 + 3
3.75y + y2 = 0 + 3

Combine like terms: 0 + 3 = 3
3.75y + y2 = 3

The y term is 3.75y.  Take half its coefficient (1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
3.75y + 3.515625 + y2 = 3 + 3.515625

Reorder the terms:
3.515625 + 3.75y + y2 = 3 + 3.515625

Combine like terms: 3 + 3.515625 = 6.515625
3.515625 + 3.75y + y2 = 6.515625

Factor a perfect square on the left side:
(y + 1.875)(y + 1.875) = 6.515625

Calculate the square root of the right side: 2.552572232

Break this problem into two subproblems by setting 
(y + 1.875) equal to 2.552572232 and -2.552572232.

Subproblem 1

y + 1.875 = 2.552572232 Simplifying y + 1.875 = 2.552572232 Reorder the terms: 1.875 + y = 2.552572232 Solving 1.875 + y = 2.552572232 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + y = 2.552572232 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + y = 2.552572232 + -1.875 y = 2.552572232 + -1.875 Combine like terms: 2.552572232 + -1.875 = 0.677572232 y = 0.677572232 Simplifying y = 0.677572232

Subproblem 2

y + 1.875 = -2.552572232 Simplifying y + 1.875 = -2.552572232 Reorder the terms: 1.875 + y = -2.552572232 Solving 1.875 + y = -2.552572232 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + y = -2.552572232 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + y = -2.552572232 + -1.875 y = -2.552572232 + -1.875 Combine like terms: -2.552572232 + -1.875 = -4.427572232 y = -4.427572232 Simplifying y = -4.427572232

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.677572232, -4.427572232}

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