4y^2-18y+18=1

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Solution for 4y^2-18y+18=1 equation:


Simplifying
4y2 + -18y + 18 = 1

Reorder the terms:
18 + -18y + 4y2 = 1

Solving
18 + -18y + 4y2 = 1

Solving for variable 'y'.

Reorder the terms:
18 + -1 + -18y + 4y2 = 1 + -1

Combine like terms: 18 + -1 = 17
17 + -18y + 4y2 = 1 + -1

Combine like terms: 1 + -1 = 0
17 + -18y + 4y2 = 0

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

Divide each side by '4'.
4.25 + -4.5y + y2 = 0

Move the constant term to the right:

Add '-4.25' to each side of the equation.
4.25 + -4.5y + -4.25 + y2 = 0 + -4.25

Reorder the terms:
4.25 + -4.25 + -4.5y + y2 = 0 + -4.25

Combine like terms: 4.25 + -4.25 = 0.00
0.00 + -4.5y + y2 = 0 + -4.25
-4.5y + y2 = 0 + -4.25

Combine like terms: 0 + -4.25 = -4.25
-4.5y + y2 = -4.25

The y term is -4.5y.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5y + 5.0625 + y2 = -4.25 + 5.0625

Reorder the terms:
5.0625 + -4.5y + y2 = -4.25 + 5.0625

Combine like terms: -4.25 + 5.0625 = 0.8125
5.0625 + -4.5y + y2 = 0.8125

Factor a perfect square on the left side:
(y + -2.25)(y + -2.25) = 0.8125

Calculate the square root of the right side: 0.901387819

Break this problem into two subproblems by setting 
(y + -2.25) equal to 0.901387819 and -0.901387819.

Subproblem 1

y + -2.25 = 0.901387819 Simplifying y + -2.25 = 0.901387819 Reorder the terms: -2.25 + y = 0.901387819 Solving -2.25 + y = 0.901387819 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + y = 0.901387819 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = 0.901387819 + 2.25 y = 0.901387819 + 2.25 Combine like terms: 0.901387819 + 2.25 = 3.151387819 y = 3.151387819 Simplifying y = 3.151387819

Subproblem 2

y + -2.25 = -0.901387819 Simplifying y + -2.25 = -0.901387819 Reorder the terms: -2.25 + y = -0.901387819 Solving -2.25 + y = -0.901387819 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + y = -0.901387819 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = -0.901387819 + 2.25 y = -0.901387819 + 2.25 Combine like terms: -0.901387819 + 2.25 = 1.348612181 y = 1.348612181 Simplifying y = 1.348612181

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.151387819, 1.348612181}

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