18.75=y^2-4y+4

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Solution for 18.75=y^2-4y+4 equation:


Simplifying
18.75 = y2 + -4y + 4

Reorder the terms:
18.75 = 4 + -4y + y2

Solving
18.75 = 4 + -4y + y2

Solving for variable 'y'.

Combine like terms: 18.75 + -4 = 14.75
14.75 + 4y + -1y2 = 4 + -4y + y2 + -4 + 4y + -1y2

Reorder the terms:
14.75 + 4y + -1y2 = 4 + -4 + -4y + 4y + y2 + -1y2

Combine like terms: 4 + -4 = 0
14.75 + 4y + -1y2 = 0 + -4y + 4y + y2 + -1y2
14.75 + 4y + -1y2 = -4y + 4y + y2 + -1y2

Combine like terms: -4y + 4y = 0
14.75 + 4y + -1y2 = 0 + y2 + -1y2
14.75 + 4y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
14.75 + 4y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-14.75 + -4y + y2 = 0

Move the constant term to the right:

Add '14.75' to each side of the equation.
-14.75 + -4y + 14.75 + y2 = 0 + 14.75

Reorder the terms:
-14.75 + 14.75 + -4y + y2 = 0 + 14.75

Combine like terms: -14.75 + 14.75 = 0.00
0.00 + -4y + y2 = 0 + 14.75
-4y + y2 = 0 + 14.75

Combine like terms: 0 + 14.75 = 14.75
-4y + y2 = 14.75

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = 14.75 + 4

Reorder the terms:
4 + -4y + y2 = 14.75 + 4

Combine like terms: 14.75 + 4 = 18.75
4 + -4y + y2 = 18.75

Factor a perfect square on the left side:
(y + -2)(y + -2) = 18.75

Calculate the square root of the right side: 4.330127019

Break this problem into two subproblems by setting 
(y + -2) equal to 4.330127019 and -4.330127019.

Subproblem 1

y + -2 = 4.330127019 Simplifying y + -2 = 4.330127019 Reorder the terms: -2 + y = 4.330127019 Solving -2 + y = 4.330127019 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 4.330127019 + 2 Combine like terms: -2 + 2 = 0 0 + y = 4.330127019 + 2 y = 4.330127019 + 2 Combine like terms: 4.330127019 + 2 = 6.330127019 y = 6.330127019 Simplifying y = 6.330127019

Subproblem 2

y + -2 = -4.330127019 Simplifying y + -2 = -4.330127019 Reorder the terms: -2 + y = -4.330127019 Solving -2 + y = -4.330127019 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -4.330127019 + 2 Combine like terms: -2 + 2 = 0 0 + y = -4.330127019 + 2 y = -4.330127019 + 2 Combine like terms: -4.330127019 + 2 = -2.330127019 y = -2.330127019 Simplifying y = -2.330127019

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.330127019, -2.330127019}

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