r^2-16r-48=0

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Solution for r^2-16r-48=0 equation:


Simplifying
r2 + -16r + -48 = 0

Reorder the terms:
-48 + -16r + r2 = 0

Solving
-48 + -16r + r2 = 0

Solving for variable 'r'.

Begin completing the square.

Move the constant term to the right:

Add '48' to each side of the equation.
-48 + -16r + 48 + r2 = 0 + 48

Reorder the terms:
-48 + 48 + -16r + r2 = 0 + 48

Combine like terms: -48 + 48 = 0
0 + -16r + r2 = 0 + 48
-16r + r2 = 0 + 48

Combine like terms: 0 + 48 = 48
-16r + r2 = 48

The r term is -16r.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16r + 64 + r2 = 48 + 64

Reorder the terms:
64 + -16r + r2 = 48 + 64

Combine like terms: 48 + 64 = 112
64 + -16r + r2 = 112

Factor a perfect square on the left side:
(r + -8)(r + -8) = 112

Calculate the square root of the right side: 10.583005244

Break this problem into two subproblems by setting 
(r + -8) equal to 10.583005244 and -10.583005244.

Subproblem 1

r + -8 = 10.583005244 Simplifying r + -8 = 10.583005244 Reorder the terms: -8 + r = 10.583005244 Solving -8 + r = 10.583005244 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + r = 10.583005244 + 8 Combine like terms: -8 + 8 = 0 0 + r = 10.583005244 + 8 r = 10.583005244 + 8 Combine like terms: 10.583005244 + 8 = 18.583005244 r = 18.583005244 Simplifying r = 18.583005244

Subproblem 2

r + -8 = -10.583005244 Simplifying r + -8 = -10.583005244 Reorder the terms: -8 + r = -10.583005244 Solving -8 + r = -10.583005244 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + r = -10.583005244 + 8 Combine like terms: -8 + 8 = 0 0 + r = -10.583005244 + 8 r = -10.583005244 + 8 Combine like terms: -10.583005244 + 8 = -2.583005244 r = -2.583005244 Simplifying r = -2.583005244

Solution

The solution to the problem is based on the solutions from the subproblems. r = {18.583005244, -2.583005244}

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