28y^2+43y-480=0

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Solution for 28y^2+43y-480=0 equation:


Simplifying
28y2 + 43y + -480 = 0

Reorder the terms:
-480 + 43y + 28y2 = 0

Solving
-480 + 43y + 28y2 = 0

Solving for variable 'y'.

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

Divide each side by '28'.
-17.14285714 + 1.535714286y + y2 = 0

Move the constant term to the right:

Add '17.14285714' to each side of the equation.
-17.14285714 + 1.535714286y + 17.14285714 + y2 = 0 + 17.14285714

Reorder the terms:
-17.14285714 + 17.14285714 + 1.535714286y + y2 = 0 + 17.14285714

Combine like terms: -17.14285714 + 17.14285714 = 0.00000000
0.00000000 + 1.535714286y + y2 = 0 + 17.14285714
1.535714286y + y2 = 0 + 17.14285714

Combine like terms: 0 + 17.14285714 = 17.14285714
1.535714286y + y2 = 17.14285714

The y term is 1.535714286y.  Take half its coefficient (0.767857143).
Square it (0.5896045921) and add it to both sides.

Add '0.5896045921' to each side of the equation.
1.535714286y + 0.5896045921 + y2 = 17.14285714 + 0.5896045921

Reorder the terms:
0.5896045921 + 1.535714286y + y2 = 17.14285714 + 0.5896045921

Combine like terms: 17.14285714 + 0.5896045921 = 17.7324617321
0.5896045921 + 1.535714286y + y2 = 17.7324617321

Factor a perfect square on the left side:
(y + 0.767857143)(y + 0.767857143) = 17.7324617321

Calculate the square root of the right side: 4.210992963

Break this problem into two subproblems by setting 
(y + 0.767857143) equal to 4.210992963 and -4.210992963.

Subproblem 1

y + 0.767857143 = 4.210992963 Simplifying y + 0.767857143 = 4.210992963 Reorder the terms: 0.767857143 + y = 4.210992963 Solving 0.767857143 + y = 4.210992963 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.767857143' to each side of the equation. 0.767857143 + -0.767857143 + y = 4.210992963 + -0.767857143 Combine like terms: 0.767857143 + -0.767857143 = 0.000000000 0.000000000 + y = 4.210992963 + -0.767857143 y = 4.210992963 + -0.767857143 Combine like terms: 4.210992963 + -0.767857143 = 3.44313582 y = 3.44313582 Simplifying y = 3.44313582

Subproblem 2

y + 0.767857143 = -4.210992963 Simplifying y + 0.767857143 = -4.210992963 Reorder the terms: 0.767857143 + y = -4.210992963 Solving 0.767857143 + y = -4.210992963 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.767857143' to each side of the equation. 0.767857143 + -0.767857143 + y = -4.210992963 + -0.767857143 Combine like terms: 0.767857143 + -0.767857143 = 0.000000000 0.000000000 + y = -4.210992963 + -0.767857143 y = -4.210992963 + -0.767857143 Combine like terms: -4.210992963 + -0.767857143 = -4.978850106 y = -4.978850106 Simplifying y = -4.978850106

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.44313582, -4.978850106}

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