4r^2-17r+12=0

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Solution for 4r^2-17r+12=0 equation:


Simplifying
4r2 + -17r + 12 = 0

Reorder the terms:
12 + -17r + 4r2 = 0

Solving
12 + -17r + 4r2 = 0

Solving for variable 'r'.

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

Divide each side by '4'.
3 + -4.25r + r2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -4.25r + -3 + r2 = 0 + -3

Reorder the terms:
3 + -3 + -4.25r + r2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -4.25r + r2 = 0 + -3
-4.25r + r2 = 0 + -3

Combine like terms: 0 + -3 = -3
-4.25r + r2 = -3

The r term is -4.25r.  Take half its coefficient (-2.125).
Square it (4.515625) and add it to both sides.

Add '4.515625' to each side of the equation.
-4.25r + 4.515625 + r2 = -3 + 4.515625

Reorder the terms:
4.515625 + -4.25r + r2 = -3 + 4.515625

Combine like terms: -3 + 4.515625 = 1.515625
4.515625 + -4.25r + r2 = 1.515625

Factor a perfect square on the left side:
(r + -2.125)(r + -2.125) = 1.515625

Calculate the square root of the right side: 1.231107225

Break this problem into two subproblems by setting 
(r + -2.125) equal to 1.231107225 and -1.231107225.

Subproblem 1

r + -2.125 = 1.231107225 Simplifying r + -2.125 = 1.231107225 Reorder the terms: -2.125 + r = 1.231107225 Solving -2.125 + r = 1.231107225 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2.125' to each side of the equation. -2.125 + 2.125 + r = 1.231107225 + 2.125 Combine like terms: -2.125 + 2.125 = 0.000 0.000 + r = 1.231107225 + 2.125 r = 1.231107225 + 2.125 Combine like terms: 1.231107225 + 2.125 = 3.356107225 r = 3.356107225 Simplifying r = 3.356107225

Subproblem 2

r + -2.125 = -1.231107225 Simplifying r + -2.125 = -1.231107225 Reorder the terms: -2.125 + r = -1.231107225 Solving -2.125 + r = -1.231107225 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2.125' to each side of the equation. -2.125 + 2.125 + r = -1.231107225 + 2.125 Combine like terms: -2.125 + 2.125 = 0.000 0.000 + r = -1.231107225 + 2.125 r = -1.231107225 + 2.125 Combine like terms: -1.231107225 + 2.125 = 0.893892775 r = 0.893892775 Simplifying r = 0.893892775

Solution

The solution to the problem is based on the solutions from the subproblems. r = {3.356107225, 0.893892775}

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