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

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


Simplifying
y2 + (y + 3)(y + -5) = 0

Reorder the terms:
y2 + (3 + y)(y + -5) = 0

Reorder the terms:
y2 + (3 + y)(-5 + y) = 0

Multiply (3 + y) * (-5 + y)
y2 + (3(-5 + y) + y(-5 + y)) = 0
y2 + ((-5 * 3 + y * 3) + y(-5 + y)) = 0
y2 + ((-15 + 3y) + y(-5 + y)) = 0
y2 + (-15 + 3y + (-5 * y + y * y)) = 0
y2 + (-15 + 3y + (-5y + y2)) = 0

Combine like terms: 3y + -5y = -2y
y2 + (-15 + -2y + y2) = 0

Reorder the terms:
-15 + -2y + y2 + y2 = 0

Combine like terms: y2 + y2 = 2y2
-15 + -2y + 2y2 = 0

Solving
-15 + -2y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-7.5 + -1y + y2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + -1y + 7.5 + y2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + -1y + y2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + -1y + y2 = 0 + 7.5
-1y + y2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
-1y + y2 = 7.5

The y term is -1y.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = 7.5 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 7.5 + 0.25

Combine like terms: 7.5 + 0.25 = 7.75
0.25 + -1y + y2 = 7.75

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 7.75

Calculate the square root of the right side: 2.783882181

Break this problem into two subproblems by setting 
(y + -0.5) equal to 2.783882181 and -2.783882181.

Subproblem 1

y + -0.5 = 2.783882181 Simplifying y + -0.5 = 2.783882181 Reorder the terms: -0.5 + y = 2.783882181 Solving -0.5 + y = 2.783882181 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 2.783882181 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 2.783882181 + 0.5 y = 2.783882181 + 0.5 Combine like terms: 2.783882181 + 0.5 = 3.283882181 y = 3.283882181 Simplifying y = 3.283882181

Subproblem 2

y + -0.5 = -2.783882181 Simplifying y + -0.5 = -2.783882181 Reorder the terms: -0.5 + y = -2.783882181 Solving -0.5 + y = -2.783882181 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -2.783882181 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -2.783882181 + 0.5 y = -2.783882181 + 0.5 Combine like terms: -2.783882181 + 0.5 = -2.283882181 y = -2.283882181 Simplifying y = -2.283882181

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.283882181, -2.283882181}

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