5r^2+24r-125=0

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Solution for 5r^2+24r-125=0 equation:


Simplifying
5r2 + 24r + -125 = 0

Reorder the terms:
-125 + 24r + 5r2 = 0

Solving
-125 + 24r + 5r2 = 0

Solving for variable 'r'.

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

Divide each side by '5'.
-25 + 4.8r + r2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 4.8r + 25 + r2 = 0 + 25

Reorder the terms:
-25 + 25 + 4.8r + r2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 4.8r + r2 = 0 + 25
4.8r + r2 = 0 + 25

Combine like terms: 0 + 25 = 25
4.8r + r2 = 25

The r term is 4.8r.  Take half its coefficient (2.4).
Square it (5.76) and add it to both sides.

Add '5.76' to each side of the equation.
4.8r + 5.76 + r2 = 25 + 5.76

Reorder the terms:
5.76 + 4.8r + r2 = 25 + 5.76

Combine like terms: 25 + 5.76 = 30.76
5.76 + 4.8r + r2 = 30.76

Factor a perfect square on the left side:
(r + 2.4)(r + 2.4) = 30.76

Calculate the square root of the right side: 5.54616985

Break this problem into two subproblems by setting 
(r + 2.4) equal to 5.54616985 and -5.54616985.

Subproblem 1

r + 2.4 = 5.54616985 Simplifying r + 2.4 = 5.54616985 Reorder the terms: 2.4 + r = 5.54616985 Solving 2.4 + r = 5.54616985 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + r = 5.54616985 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + r = 5.54616985 + -2.4 r = 5.54616985 + -2.4 Combine like terms: 5.54616985 + -2.4 = 3.14616985 r = 3.14616985 Simplifying r = 3.14616985

Subproblem 2

r + 2.4 = -5.54616985 Simplifying r + 2.4 = -5.54616985 Reorder the terms: 2.4 + r = -5.54616985 Solving 2.4 + r = -5.54616985 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + r = -5.54616985 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + r = -5.54616985 + -2.4 r = -5.54616985 + -2.4 Combine like terms: -5.54616985 + -2.4 = -7.94616985 r = -7.94616985 Simplifying r = -7.94616985

Solution

The solution to the problem is based on the solutions from the subproblems. r = {3.14616985, -7.94616985}

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