4r^2+4r=33

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Solution for 4r^2+4r=33 equation:


Simplifying
4r2 + 4r = 33

Reorder the terms:
4r + 4r2 = 33

Solving
4r + 4r2 = 33

Solving for variable 'r'.

Reorder the terms:
-33 + 4r + 4r2 = 33 + -33

Combine like terms: 33 + -33 = 0
-33 + 4r + 4r2 = 0

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

Divide each side by '4'.
-8.25 + r + r2 = 0

Move the constant term to the right:

Add '8.25' to each side of the equation.
-8.25 + r + 8.25 + r2 = 0 + 8.25

Reorder the terms:
-8.25 + 8.25 + r + r2 = 0 + 8.25

Combine like terms: -8.25 + 8.25 = 0.00
0.00 + r + r2 = 0 + 8.25
r + r2 = 0 + 8.25

Combine like terms: 0 + 8.25 = 8.25
r + r2 = 8.25

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 = 8.25 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + r2 = 8.25 + 0.25

Combine like terms: 8.25 + 0.25 = 8.5
1.25 + r2 = 8.5

Factor a perfect square on the left side:
(r + 0.5)(r + 0.5) = 8.5

Calculate the square root of the right side: 2.915475947

Break this problem into two subproblems by setting 
(r + 0.5) equal to 2.915475947 and -2.915475947.

Subproblem 1

r + 0.5 = 2.915475947 Simplifying r + 0.5 = 2.915475947 Reorder the terms: 0.5 + r = 2.915475947 Solving 0.5 + r = 2.915475947 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 = 2.915475947 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + r = 2.915475947 + -0.5 r = 2.915475947 + -0.5 Combine like terms: 2.915475947 + -0.5 = 2.415475947 r = 2.415475947 Simplifying r = 2.415475947

Subproblem 2

r + 0.5 = -2.915475947 Simplifying r + 0.5 = -2.915475947 Reorder the terms: 0.5 + r = -2.915475947 Solving 0.5 + r = -2.915475947 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 = -2.915475947 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + r = -2.915475947 + -0.5 r = -2.915475947 + -0.5 Combine like terms: -2.915475947 + -0.5 = -3.415475947 r = -3.415475947 Simplifying r = -3.415475947

Solution

The solution to the problem is based on the solutions from the subproblems. r = {2.415475947, -3.415475947}

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