y^2-5y+4=1

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Solution for y^2-5y+4=1 equation:


Simplifying
y2 + -5y + 4 = 1

Reorder the terms:
4 + -5y + y2 = 1

Solving
4 + -5y + y2 = 1

Solving for variable 'y'.

Reorder the terms:
4 + -1 + -5y + y2 = 1 + -1

Combine like terms: 4 + -1 = 3
3 + -5y + y2 = 1 + -1

Combine like terms: 1 + -1 = 0
3 + -5y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -5y + -3 + y2 = 0 + -3

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

Combine like terms: 3 + -3 = 0
0 + -5y + y2 = 0 + -3
-5y + y2 = 0 + -3

Combine like terms: 0 + -3 = -3
-5y + y2 = -3

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = -3 + 6.25

Reorder the terms:
6.25 + -5y + y2 = -3 + 6.25

Combine like terms: -3 + 6.25 = 3.25
6.25 + -5y + y2 = 3.25

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(y + -2.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

y + -2.5 = 1.802775638 Simplifying y + -2.5 = 1.802775638 Reorder the terms: -2.5 + y = 1.802775638 Solving -2.5 + y = 1.802775638 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 1.802775638 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 1.802775638 + 2.5 y = 1.802775638 + 2.5 Combine like terms: 1.802775638 + 2.5 = 4.302775638 y = 4.302775638 Simplifying y = 4.302775638

Subproblem 2

y + -2.5 = -1.802775638 Simplifying y + -2.5 = -1.802775638 Reorder the terms: -2.5 + y = -1.802775638 Solving -2.5 + y = -1.802775638 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = -1.802775638 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = -1.802775638 + 2.5 y = -1.802775638 + 2.5 Combine like terms: -1.802775638 + 2.5 = 0.697224362 y = 0.697224362 Simplifying y = 0.697224362

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.302775638, 0.697224362}

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