(6r^2+5r-12)+(-5r^2-13r+6)=

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Solution for (6r^2+5r-12)+(-5r^2-13r+6)= equation:


Simplifying
(6r2 + 5r + -12) + (-5r2 + -13r + 6) = 0

Reorder the terms:
(-12 + 5r + 6r2) + (-5r2 + -13r + 6) = 0

Remove parenthesis around (-12 + 5r + 6r2)
-12 + 5r + 6r2 + (-5r2 + -13r + 6) = 0

Reorder the terms:
-12 + 5r + 6r2 + (6 + -13r + -5r2) = 0

Remove parenthesis around (6 + -13r + -5r2)
-12 + 5r + 6r2 + 6 + -13r + -5r2 = 0

Reorder the terms:
-12 + 6 + 5r + -13r + 6r2 + -5r2 = 0

Combine like terms: -12 + 6 = -6
-6 + 5r + -13r + 6r2 + -5r2 = 0

Combine like terms: 5r + -13r = -8r
-6 + -8r + 6r2 + -5r2 = 0

Combine like terms: 6r2 + -5r2 = 1r2
-6 + -8r + 1r2 = 0

Solving
-6 + -8r + 1r2 = 0

Solving for variable 'r'.

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -8r + 6 + r2 = 0 + 6

Reorder the terms:
-6 + 6 + -8r + r2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -8r + r2 = 0 + 6
-8r + r2 = 0 + 6

Combine like terms: 0 + 6 = 6
-8r + r2 = 6

The r term is -8r.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8r + 16 + r2 = 6 + 16

Reorder the terms:
16 + -8r + r2 = 6 + 16

Combine like terms: 6 + 16 = 22
16 + -8r + r2 = 22

Factor a perfect square on the left side:
(r + -4)(r + -4) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(r + -4) equal to 4.69041576 and -4.69041576.

Subproblem 1

r + -4 = 4.69041576 Simplifying r + -4 = 4.69041576 Reorder the terms: -4 + r = 4.69041576 Solving -4 + r = 4.69041576 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + r = 4.69041576 + 4 Combine like terms: -4 + 4 = 0 0 + r = 4.69041576 + 4 r = 4.69041576 + 4 Combine like terms: 4.69041576 + 4 = 8.69041576 r = 8.69041576 Simplifying r = 8.69041576

Subproblem 2

r + -4 = -4.69041576 Simplifying r + -4 = -4.69041576 Reorder the terms: -4 + r = -4.69041576 Solving -4 + r = -4.69041576 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + r = -4.69041576 + 4 Combine like terms: -4 + 4 = 0 0 + r = -4.69041576 + 4 r = -4.69041576 + 4 Combine like terms: -4.69041576 + 4 = -0.69041576 r = -0.69041576 Simplifying r = -0.69041576

Solution

The solution to the problem is based on the solutions from the subproblems. r = {8.69041576, -0.69041576}

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