5p(p+1)=11

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Solution for 5p(p+1)=11 equation:


Simplifying
5p(p + 1) = 11

Reorder the terms:
5p(1 + p) = 11
(1 * 5p + p * 5p) = 11
(5p + 5p2) = 11

Solving
5p + 5p2 = 11

Solving for variable 'p'.

Reorder the terms:
-11 + 5p + 5p2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 5p + 5p2 = 0

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

Divide each side by '5'.
-2.2 + p + p2 = 0

Move the constant term to the right:

Add '2.2' to each side of the equation.
-2.2 + p + 2.2 + p2 = 0 + 2.2

Reorder the terms:
-2.2 + 2.2 + p + p2 = 0 + 2.2

Combine like terms: -2.2 + 2.2 = 0.0
0.0 + p + p2 = 0 + 2.2
p + p2 = 0 + 2.2

Combine like terms: 0 + 2.2 = 2.2
p + p2 = 2.2

The p term is p.  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 + p2 = 2.2 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + p2 = 2.2 + 0.25

Combine like terms: 2.2 + 0.25 = 2.45
1.25 + p2 = 2.45

Factor a perfect square on the left side:
(p + 0.5)(p + 0.5) = 2.45

Calculate the square root of the right side: 1.565247584

Break this problem into two subproblems by setting 
(p + 0.5) equal to 1.565247584 and -1.565247584.

Subproblem 1

p + 0.5 = 1.565247584 Simplifying p + 0.5 = 1.565247584 Reorder the terms: 0.5 + p = 1.565247584 Solving 0.5 + p = 1.565247584 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + p = 1.565247584 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + p = 1.565247584 + -0.5 p = 1.565247584 + -0.5 Combine like terms: 1.565247584 + -0.5 = 1.065247584 p = 1.065247584 Simplifying p = 1.065247584

Subproblem 2

p + 0.5 = -1.565247584 Simplifying p + 0.5 = -1.565247584 Reorder the terms: 0.5 + p = -1.565247584 Solving 0.5 + p = -1.565247584 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + p = -1.565247584 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + p = -1.565247584 + -0.5 p = -1.565247584 + -0.5 Combine like terms: -1.565247584 + -0.5 = -2.065247584 p = -2.065247584 Simplifying p = -2.065247584

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.065247584, -2.065247584}

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