y^2-20y=-29

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Solution for y^2-20y=-29 equation:


Simplifying
y2 + -20y = -29

Reorder the terms:
-20y + y2 = -29

Solving
-20y + y2 = -29

Solving for variable 'y'.

Reorder the terms:
29 + -20y + y2 = -29 + 29

Combine like terms: -29 + 29 = 0
29 + -20y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-29' to each side of the equation.
29 + -20y + -29 + y2 = 0 + -29

Reorder the terms:
29 + -29 + -20y + y2 = 0 + -29

Combine like terms: 29 + -29 = 0
0 + -20y + y2 = 0 + -29
-20y + y2 = 0 + -29

Combine like terms: 0 + -29 = -29
-20y + y2 = -29

The y term is -20y.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20y + 100 + y2 = -29 + 100

Reorder the terms:
100 + -20y + y2 = -29 + 100

Combine like terms: -29 + 100 = 71
100 + -20y + y2 = 71

Factor a perfect square on the left side:
(y + -10)(y + -10) = 71

Calculate the square root of the right side: 8.426149773

Break this problem into two subproblems by setting 
(y + -10) equal to 8.426149773 and -8.426149773.

Subproblem 1

y + -10 = 8.426149773 Simplifying y + -10 = 8.426149773 Reorder the terms: -10 + y = 8.426149773 Solving -10 + y = 8.426149773 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + y = 8.426149773 + 10 Combine like terms: -10 + 10 = 0 0 + y = 8.426149773 + 10 y = 8.426149773 + 10 Combine like terms: 8.426149773 + 10 = 18.426149773 y = 18.426149773 Simplifying y = 18.426149773

Subproblem 2

y + -10 = -8.426149773 Simplifying y + -10 = -8.426149773 Reorder the terms: -10 + y = -8.426149773 Solving -10 + y = -8.426149773 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + y = -8.426149773 + 10 Combine like terms: -10 + 10 = 0 0 + y = -8.426149773 + 10 y = -8.426149773 + 10 Combine like terms: -8.426149773 + 10 = 1.573850227 y = 1.573850227 Simplifying y = 1.573850227

Solution

The solution to the problem is based on the solutions from the subproblems. y = {18.426149773, 1.573850227}

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