7-3y^2=5y

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Solution for 7-3y^2=5y equation:


Simplifying
7 + -3y2 = 5y

Solving
7 + -3y2 = 5y

Solving for variable 'y'.

Reorder the terms:
7 + -5y + -3y2 = 5y + -5y

Combine like terms: 5y + -5y = 0
7 + -5y + -3y2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-2.333333333 + 1.666666667y + y2 = 0

Move the constant term to the right:

Add '2.333333333' to each side of the equation.
-2.333333333 + 1.666666667y + 2.333333333 + y2 = 0 + 2.333333333

Reorder the terms:
-2.333333333 + 2.333333333 + 1.666666667y + y2 = 0 + 2.333333333

Combine like terms: -2.333333333 + 2.333333333 = 0.000000000
0.000000000 + 1.666666667y + y2 = 0 + 2.333333333
1.666666667y + y2 = 0 + 2.333333333

Combine like terms: 0 + 2.333333333 = 2.333333333
1.666666667y + y2 = 2.333333333

The y term is 1.666666667y.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667y + 0.6944444447 + y2 = 2.333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667y + y2 = 2.333333333 + 0.6944444447

Combine like terms: 2.333333333 + 0.6944444447 = 3.0277777777
0.6944444447 + 1.666666667y + y2 = 3.0277777777

Factor a perfect square on the left side:
(y + 0.8333333335)(y + 0.8333333335) = 3.0277777777

Calculate the square root of the right side: 1.740051085

Break this problem into two subproblems by setting 
(y + 0.8333333335) equal to 1.740051085 and -1.740051085.

Subproblem 1

y + 0.8333333335 = 1.740051085 Simplifying y + 0.8333333335 = 1.740051085 Reorder the terms: 0.8333333335 + y = 1.740051085 Solving 0.8333333335 + y = 1.740051085 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + y = 1.740051085 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + y = 1.740051085 + -0.8333333335 y = 1.740051085 + -0.8333333335 Combine like terms: 1.740051085 + -0.8333333335 = 0.9067177515 y = 0.9067177515 Simplifying y = 0.9067177515

Subproblem 2

y + 0.8333333335 = -1.740051085 Simplifying y + 0.8333333335 = -1.740051085 Reorder the terms: 0.8333333335 + y = -1.740051085 Solving 0.8333333335 + y = -1.740051085 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + y = -1.740051085 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + y = -1.740051085 + -0.8333333335 y = -1.740051085 + -0.8333333335 Combine like terms: -1.740051085 + -0.8333333335 = -2.5733844185 y = -2.5733844185 Simplifying y = -2.5733844185

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.9067177515, -2.5733844185}

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