7=5y^2+3y-5

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


Simplifying
7 = 5y2 + 3y + -5

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

Solving
7 = -5 + 3y + 5y2

Solving for variable 'y'.

Combine like terms: 7 + 5 = 12
12 + -3y + -5y2 = -5 + 3y + 5y2 + 5 + -3y + -5y2

Reorder the terms:
12 + -3y + -5y2 = -5 + 5 + 3y + -3y + 5y2 + -5y2

Combine like terms: -5 + 5 = 0
12 + -3y + -5y2 = 0 + 3y + -3y + 5y2 + -5y2
12 + -3y + -5y2 = 3y + -3y + 5y2 + -5y2

Combine like terms: 3y + -3y = 0
12 + -3y + -5y2 = 0 + 5y2 + -5y2
12 + -3y + -5y2 = 5y2 + -5y2

Combine like terms: 5y2 + -5y2 = 0
12 + -3y + -5y2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-2.4 + 0.6y + y2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + 0.6y + 2.4 + y2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + 0.6y + y2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + 0.6y + y2 = 0 + 2.4
0.6y + y2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
0.6y + y2 = 2.4

The y term is 0.6y.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6y + 0.09 + y2 = 2.4 + 0.09

Reorder the terms:
0.09 + 0.6y + y2 = 2.4 + 0.09

Combine like terms: 2.4 + 0.09 = 2.49
0.09 + 0.6y + y2 = 2.49

Factor a perfect square on the left side:
(y + 0.3)(y + 0.3) = 2.49

Calculate the square root of the right side: 1.577973384

Break this problem into two subproblems by setting 
(y + 0.3) equal to 1.577973384 and -1.577973384.

Subproblem 1

y + 0.3 = 1.577973384 Simplifying y + 0.3 = 1.577973384 Reorder the terms: 0.3 + y = 1.577973384 Solving 0.3 + y = 1.577973384 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + y = 1.577973384 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + y = 1.577973384 + -0.3 y = 1.577973384 + -0.3 Combine like terms: 1.577973384 + -0.3 = 1.277973384 y = 1.277973384 Simplifying y = 1.277973384

Subproblem 2

y + 0.3 = -1.577973384 Simplifying y + 0.3 = -1.577973384 Reorder the terms: 0.3 + y = -1.577973384 Solving 0.3 + y = -1.577973384 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + y = -1.577973384 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + y = -1.577973384 + -0.3 y = -1.577973384 + -0.3 Combine like terms: -1.577973384 + -0.3 = -1.877973384 y = -1.877973384 Simplifying y = -1.877973384

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.277973384, -1.877973384}

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