(5y-3)(2y+1)=3

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Solution for (5y-3)(2y+1)=3 equation:


Simplifying
(5y + -3)(2y + 1) = 3

Reorder the terms:
(-3 + 5y)(2y + 1) = 3

Reorder the terms:
(-3 + 5y)(1 + 2y) = 3

Multiply (-3 + 5y) * (1 + 2y)
(-3(1 + 2y) + 5y * (1 + 2y)) = 3
((1 * -3 + 2y * -3) + 5y * (1 + 2y)) = 3
((-3 + -6y) + 5y * (1 + 2y)) = 3
(-3 + -6y + (1 * 5y + 2y * 5y)) = 3
(-3 + -6y + (5y + 10y2)) = 3

Combine like terms: -6y + 5y = -1y
(-3 + -1y + 10y2) = 3

Solving
-3 + -1y + 10y2 = 3

Solving for variable 'y'.

Reorder the terms:
-3 + -3 + -1y + 10y2 = 3 + -3

Combine like terms: -3 + -3 = -6
-6 + -1y + 10y2 = 3 + -3

Combine like terms: 3 + -3 = 0
-6 + -1y + 10y2 = 0

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

Divide each side by '10'.
-0.6 + -0.1y + y2 = 0.0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -0.1y + 0.6 + y2 = 0.0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -0.1y + y2 = 0.0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -0.1y + y2 = 0.0 + 0.6
-0.1y + y2 = 0.0 + 0.6

Combine like terms: 0.0 + 0.6 = 0.6
-0.1y + y2 = 0.6

The y term is -0.1y.  Take half its coefficient (-0.05).
Square it (0.0025) and add it to both sides.

Add '0.0025' to each side of the equation.
-0.1y + 0.0025 + y2 = 0.6 + 0.0025

Reorder the terms:
0.0025 + -0.1y + y2 = 0.6 + 0.0025

Combine like terms: 0.6 + 0.0025 = 0.6025
0.0025 + -0.1y + y2 = 0.6025

Factor a perfect square on the left side:
(y + -0.05)(y + -0.05) = 0.6025

Calculate the square root of the right side: 0.776208735

Break this problem into two subproblems by setting 
(y + -0.05) equal to 0.776208735 and -0.776208735.

Subproblem 1

y + -0.05 = 0.776208735 Simplifying y + -0.05 = 0.776208735 Reorder the terms: -0.05 + y = 0.776208735 Solving -0.05 + y = 0.776208735 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.05' to each side of the equation. -0.05 + 0.05 + y = 0.776208735 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + y = 0.776208735 + 0.05 y = 0.776208735 + 0.05 Combine like terms: 0.776208735 + 0.05 = 0.826208735 y = 0.826208735 Simplifying y = 0.826208735

Subproblem 2

y + -0.05 = -0.776208735 Simplifying y + -0.05 = -0.776208735 Reorder the terms: -0.05 + y = -0.776208735 Solving -0.05 + y = -0.776208735 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.05' to each side of the equation. -0.05 + 0.05 + y = -0.776208735 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + y = -0.776208735 + 0.05 y = -0.776208735 + 0.05 Combine like terms: -0.776208735 + 0.05 = -0.726208735 y = -0.726208735 Simplifying y = -0.726208735

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.826208735, -0.726208735}

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