10r^2=-12r+5

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Solution for 10r^2=-12r+5 equation:


Simplifying
10r2 = -12r + 5

Reorder the terms:
10r2 = 5 + -12r

Solving
10r2 = 5 + -12r

Solving for variable 'r'.

Reorder the terms:
-5 + 12r + 10r2 = 5 + -12r + -5 + 12r

Reorder the terms:
-5 + 12r + 10r2 = 5 + -5 + -12r + 12r

Combine like terms: 5 + -5 = 0
-5 + 12r + 10r2 = 0 + -12r + 12r
-5 + 12r + 10r2 = -12r + 12r

Combine like terms: -12r + 12r = 0
-5 + 12r + 10r2 = 0

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

Divide each side by '10'.
-0.5 + 1.2r + r2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 1.2r + 0.5 + r2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 1.2r + r2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 1.2r + r2 = 0 + 0.5
1.2r + r2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
1.2r + r2 = 0.5

The r term is 1.2r.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2r + 0.36 + r2 = 0.5 + 0.36

Reorder the terms:
0.36 + 1.2r + r2 = 0.5 + 0.36

Combine like terms: 0.5 + 0.36 = 0.86
0.36 + 1.2r + r2 = 0.86

Factor a perfect square on the left side:
(r + 0.6)(r + 0.6) = 0.86

Calculate the square root of the right side: 0.92736185

Break this problem into two subproblems by setting 
(r + 0.6) equal to 0.92736185 and -0.92736185.

Subproblem 1

r + 0.6 = 0.92736185 Simplifying r + 0.6 = 0.92736185 Reorder the terms: 0.6 + r = 0.92736185 Solving 0.6 + r = 0.92736185 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + r = 0.92736185 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + r = 0.92736185 + -0.6 r = 0.92736185 + -0.6 Combine like terms: 0.92736185 + -0.6 = 0.32736185 r = 0.32736185 Simplifying r = 0.32736185

Subproblem 2

r + 0.6 = -0.92736185 Simplifying r + 0.6 = -0.92736185 Reorder the terms: 0.6 + r = -0.92736185 Solving 0.6 + r = -0.92736185 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + r = -0.92736185 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + r = -0.92736185 + -0.6 r = -0.92736185 + -0.6 Combine like terms: -0.92736185 + -0.6 = -1.52736185 r = -1.52736185 Simplifying r = -1.52736185

Solution

The solution to the problem is based on the solutions from the subproblems. r = {0.32736185, -1.52736185}

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