r^2-9r-38=-29

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Solution for r^2-9r-38=-29 equation:


Simplifying
r2 + -9r + -38 = -29

Reorder the terms:
-38 + -9r + r2 = -29

Solving
-38 + -9r + r2 = -29

Solving for variable 'r'.

Reorder the terms:
-38 + 29 + -9r + r2 = -29 + 29

Combine like terms: -38 + 29 = -9
-9 + -9r + r2 = -29 + 29

Combine like terms: -29 + 29 = 0
-9 + -9r + r2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -9r + 9 + r2 = 0 + 9

Reorder the terms:
-9 + 9 + -9r + r2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -9r + r2 = 0 + 9
-9r + r2 = 0 + 9

Combine like terms: 0 + 9 = 9
-9r + r2 = 9

The r term is -9r.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9r + 20.25 + r2 = 9 + 20.25

Reorder the terms:
20.25 + -9r + r2 = 9 + 20.25

Combine like terms: 9 + 20.25 = 29.25
20.25 + -9r + r2 = 29.25

Factor a perfect square on the left side:
(r + -4.5)(r + -4.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(r + -4.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

r + -4.5 = 5.408326913 Simplifying r + -4.5 = 5.408326913 Reorder the terms: -4.5 + r = 5.408326913 Solving -4.5 + r = 5.408326913 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + r = 5.408326913 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + r = 5.408326913 + 4.5 r = 5.408326913 + 4.5 Combine like terms: 5.408326913 + 4.5 = 9.908326913 r = 9.908326913 Simplifying r = 9.908326913

Subproblem 2

r + -4.5 = -5.408326913 Simplifying r + -4.5 = -5.408326913 Reorder the terms: -4.5 + r = -5.408326913 Solving -4.5 + r = -5.408326913 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + r = -5.408326913 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + r = -5.408326913 + 4.5 r = -5.408326913 + 4.5 Combine like terms: -5.408326913 + 4.5 = -0.908326913 r = -0.908326913 Simplifying r = -0.908326913

Solution

The solution to the problem is based on the solutions from the subproblems. r = {9.908326913, -0.908326913}

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