4y^2+28y-27=

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Solution for 4y^2+28y-27= equation:


Simplifying
4y2 + 28y + -27 = 0

Reorder the terms:
-27 + 28y + 4y2 = 0

Solving
-27 + 28y + 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'.
-6.75 + 7y + y2 = 0

Move the constant term to the right:

Add '6.75' to each side of the equation.
-6.75 + 7y + 6.75 + y2 = 0 + 6.75

Reorder the terms:
-6.75 + 6.75 + 7y + y2 = 0 + 6.75

Combine like terms: -6.75 + 6.75 = 0.00
0.00 + 7y + y2 = 0 + 6.75
7y + y2 = 0 + 6.75

Combine like terms: 0 + 6.75 = 6.75
7y + y2 = 6.75

The y term is 7y.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7y + 12.25 + y2 = 6.75 + 12.25

Reorder the terms:
12.25 + 7y + y2 = 6.75 + 12.25

Combine like terms: 6.75 + 12.25 = 19
12.25 + 7y + y2 = 19

Factor a perfect square on the left side:
(y + 3.5)(y + 3.5) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(y + 3.5) equal to 4.358898944 and -4.358898944.

Subproblem 1

y + 3.5 = 4.358898944 Simplifying y + 3.5 = 4.358898944 Reorder the terms: 3.5 + y = 4.358898944 Solving 3.5 + y = 4.358898944 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = 4.358898944 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = 4.358898944 + -3.5 y = 4.358898944 + -3.5 Combine like terms: 4.358898944 + -3.5 = 0.858898944 y = 0.858898944 Simplifying y = 0.858898944

Subproblem 2

y + 3.5 = -4.358898944 Simplifying y + 3.5 = -4.358898944 Reorder the terms: 3.5 + y = -4.358898944 Solving 3.5 + y = -4.358898944 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = -4.358898944 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = -4.358898944 + -3.5 y = -4.358898944 + -3.5 Combine like terms: -4.358898944 + -3.5 = -7.858898944 y = -7.858898944 Simplifying y = -7.858898944

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.858898944, -7.858898944}

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