71=y^2-1*y

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Solution for 71=y^2-1*y equation:


Simplifying
71 = y2 + -1y

Reorder the terms:
71 = -1y + y2

Solving
71 = -1y + y2

Solving for variable 'y'.

Reorder the terms:
71 + y + -1y2 = -1y + y + y2 + -1y2

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

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

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

Divide each side by '-1'.
-71 + -1y + y2 = 0

Move the constant term to the right:

Add '71' to each side of the equation.
-71 + -1y + 71 + y2 = 0 + 71

Reorder the terms:
-71 + 71 + -1y + y2 = 0 + 71

Combine like terms: -71 + 71 = 0
0 + -1y + y2 = 0 + 71
-1y + y2 = 0 + 71

Combine like terms: 0 + 71 = 71
-1y + y2 = 71

The y term is y.  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 = 71 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 71 + 0.25

Combine like terms: 71 + 0.25 = 71.25
0.25 + -1y + y2 = 71.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 71.25

Calculate the square root of the right side: 8.440971508

Break this problem into two subproblems by setting 
(y + 0.5) equal to 8.440971508 and -8.440971508.

Subproblem 1

y + 0.5 = 8.440971508 Simplifying y + 0.5 = 8.440971508 Reorder the terms: 0.5 + y = 8.440971508 Solving 0.5 + y = 8.440971508 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 = 8.440971508 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 8.440971508 + -0.5 y = 8.440971508 + -0.5 Combine like terms: 8.440971508 + -0.5 = 7.940971508 y = 7.940971508 Simplifying y = 7.940971508

Subproblem 2

y + 0.5 = -8.440971508 Simplifying y + 0.5 = -8.440971508 Reorder the terms: 0.5 + y = -8.440971508 Solving 0.5 + y = -8.440971508 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 = -8.440971508 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -8.440971508 + -0.5 y = -8.440971508 + -0.5 Combine like terms: -8.440971508 + -0.5 = -8.940971508 y = -8.940971508 Simplifying y = -8.940971508

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.940971508, -8.940971508}

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