19r^2+19r-35=0

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Solution for 19r^2+19r-35=0 equation:


Simplifying
19r2 + 19r + -35 = 0

Reorder the terms:
-35 + 19r + 19r2 = 0

Solving
-35 + 19r + 19r2 = 0

Solving for variable 'r'.

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

Divide each side by '19'.
-1.842105263 + r + r2 = 0

Move the constant term to the right:

Add '1.842105263' to each side of the equation.
-1.842105263 + r + 1.842105263 + r2 = 0 + 1.842105263

Reorder the terms:
-1.842105263 + 1.842105263 + r + r2 = 0 + 1.842105263

Combine like terms: -1.842105263 + 1.842105263 = 0.000000000
0.000000000 + r + r2 = 0 + 1.842105263
r + r2 = 0 + 1.842105263

Combine like terms: 0 + 1.842105263 = 1.842105263
r + r2 = 1.842105263

The r term is r.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + r2 = 1.842105263 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + r2 = 1.842105263 + 0.25

Combine like terms: 1.842105263 + 0.25 = 2.092105263
1.25 + r2 = 2.092105263

Factor a perfect square on the left side:
(r + 0.5)(r + 0.5) = 2.092105263

Calculate the square root of the right side: 1.446411167

Break this problem into two subproblems by setting 
(r + 0.5) equal to 1.446411167 and -1.446411167.

Subproblem 1

r + 0.5 = 1.446411167 Simplifying r + 0.5 = 1.446411167 Reorder the terms: 0.5 + r = 1.446411167 Solving 0.5 + r = 1.446411167 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + r = 1.446411167 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + r = 1.446411167 + -0.5 r = 1.446411167 + -0.5 Combine like terms: 1.446411167 + -0.5 = 0.946411167 r = 0.946411167 Simplifying r = 0.946411167

Subproblem 2

r + 0.5 = -1.446411167 Simplifying r + 0.5 = -1.446411167 Reorder the terms: 0.5 + r = -1.446411167 Solving 0.5 + r = -1.446411167 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + r = -1.446411167 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + r = -1.446411167 + -0.5 r = -1.446411167 + -0.5 Combine like terms: -1.446411167 + -0.5 = -1.946411167 r = -1.946411167 Simplifying r = -1.946411167

Solution

The solution to the problem is based on the solutions from the subproblems. r = {0.946411167, -1.946411167}

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