0=.5y^2-3.5y-22

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Solution for 0=.5y^2-3.5y-22 equation:


Simplifying
0 = 0.5y2 + -3.5y + -22

Reorder the terms:
0 = -22 + -3.5y + 0.5y2

Solving
0 = -22 + -3.5y + 0.5y2

Solving for variable 'y'.

Combine like terms: 0 + 22 = 22
22 + 3.5y + -0.5y2 = -22 + -3.5y + 0.5y2 + 22 + 3.5y + -0.5y2

Reorder the terms:
22 + 3.5y + -0.5y2 = -22 + 22 + -3.5y + 3.5y + 0.5y2 + -0.5y2

Combine like terms: -22 + 22 = 0
22 + 3.5y + -0.5y2 = 0 + -3.5y + 3.5y + 0.5y2 + -0.5y2
22 + 3.5y + -0.5y2 = -3.5y + 3.5y + 0.5y2 + -0.5y2

Combine like terms: -3.5y + 3.5y = 0.0
22 + 3.5y + -0.5y2 = 0.0 + 0.5y2 + -0.5y2
22 + 3.5y + -0.5y2 = 0.5y2 + -0.5y2

Combine like terms: 0.5y2 + -0.5y2 = 0.0
22 + 3.5y + -0.5y2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-44 + -7y + y2 = 0

Move the constant term to the right:

Add '44' to each side of the equation.
-44 + -7y + 44 + y2 = 0 + 44

Reorder the terms:
-44 + 44 + -7y + y2 = 0 + 44

Combine like terms: -44 + 44 = 0
0 + -7y + y2 = 0 + 44
-7y + y2 = 0 + 44

Combine like terms: 0 + 44 = 44
-7y + y2 = 44

The y term is -7y.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7y + 12.25 + y2 = 44 + 12.25

Reorder the terms:
12.25 + -7y + y2 = 44 + 12.25

Combine like terms: 44 + 12.25 = 56.25
12.25 + -7y + y2 = 56.25

Factor a perfect square on the left side:
(y + -3.5)(y + -3.5) = 56.25

Calculate the square root of the right side: 7.5

Break this problem into two subproblems by setting 
(y + -3.5) equal to 7.5 and -7.5.

Subproblem 1

y + -3.5 = 7.5 Simplifying y + -3.5 = 7.5 Reorder the terms: -3.5 + y = 7.5 Solving -3.5 + y = 7.5 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = 7.5 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = 7.5 + 3.5 y = 7.5 + 3.5 Combine like terms: 7.5 + 3.5 = 11 y = 11 Simplifying y = 11

Subproblem 2

y + -3.5 = -7.5 Simplifying y + -3.5 = -7.5 Reorder the terms: -3.5 + y = -7.5 Solving -3.5 + y = -7.5 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = -7.5 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = -7.5 + 3.5 y = -7.5 + 3.5 Combine like terms: -7.5 + 3.5 = -4 y = -4 Simplifying y = -4

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11, -4}

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