-4y^2-28y+5=0

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Solution for -4y^2-28y+5=0 equation:


Simplifying
-4y2 + -28y + 5 = 0

Reorder the terms:
5 + -28y + -4y2 = 0

Solving
5 + -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'.
-1.25 + 7y + y2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 7y + 1.25 + y2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 7y + y2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 7y + y2 = 0 + 1.25
7y + y2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
7y + y2 = 1.25

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 = 1.25 + 12.25

Reorder the terms:
12.25 + 7y + y2 = 1.25 + 12.25

Combine like terms: 1.25 + 12.25 = 13.5
12.25 + 7y + y2 = 13.5

Factor a perfect square on the left side:
(y + 3.5)(y + 3.5) = 13.5

Calculate the square root of the right side: 3.674234614

Break this problem into two subproblems by setting 
(y + 3.5) equal to 3.674234614 and -3.674234614.

Subproblem 1

y + 3.5 = 3.674234614 Simplifying y + 3.5 = 3.674234614 Reorder the terms: 3.5 + y = 3.674234614 Solving 3.5 + y = 3.674234614 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 = 3.674234614 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = 3.674234614 + -3.5 y = 3.674234614 + -3.5 Combine like terms: 3.674234614 + -3.5 = 0.174234614 y = 0.174234614 Simplifying y = 0.174234614

Subproblem 2

y + 3.5 = -3.674234614 Simplifying y + 3.5 = -3.674234614 Reorder the terms: 3.5 + y = -3.674234614 Solving 3.5 + y = -3.674234614 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 = -3.674234614 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = -3.674234614 + -3.5 y = -3.674234614 + -3.5 Combine like terms: -3.674234614 + -3.5 = -7.174234614 y = -7.174234614 Simplifying y = -7.174234614

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.174234614, -7.174234614}

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