20p^2+5p-84=0

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Solution for 20p^2+5p-84=0 equation:


Simplifying
20p2 + 5p + -84 = 0

Reorder the terms:
-84 + 5p + 20p2 = 0

Solving
-84 + 5p + 20p2 = 0

Solving for variable 'p'.

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

Divide each side by '20'.
-4.2 + 0.25p + p2 = 0

Move the constant term to the right:

Add '4.2' to each side of the equation.
-4.2 + 0.25p + 4.2 + p2 = 0 + 4.2

Reorder the terms:
-4.2 + 4.2 + 0.25p + p2 = 0 + 4.2

Combine like terms: -4.2 + 4.2 = 0.0
0.0 + 0.25p + p2 = 0 + 4.2
0.25p + p2 = 0 + 4.2

Combine like terms: 0 + 4.2 = 4.2
0.25p + p2 = 4.2

The p term is 0.25p.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25p + 0.015625 + p2 = 4.2 + 0.015625

Reorder the terms:
0.015625 + 0.25p + p2 = 4.2 + 0.015625

Combine like terms: 4.2 + 0.015625 = 4.215625
0.015625 + 0.25p + p2 = 4.215625

Factor a perfect square on the left side:
(p + 0.125)(p + 0.125) = 4.215625

Calculate the square root of the right side: 2.053198724

Break this problem into two subproblems by setting 
(p + 0.125) equal to 2.053198724 and -2.053198724.

Subproblem 1

p + 0.125 = 2.053198724 Simplifying p + 0.125 = 2.053198724 Reorder the terms: 0.125 + p = 2.053198724 Solving 0.125 + p = 2.053198724 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + p = 2.053198724 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + p = 2.053198724 + -0.125 p = 2.053198724 + -0.125 Combine like terms: 2.053198724 + -0.125 = 1.928198724 p = 1.928198724 Simplifying p = 1.928198724

Subproblem 2

p + 0.125 = -2.053198724 Simplifying p + 0.125 = -2.053198724 Reorder the terms: 0.125 + p = -2.053198724 Solving 0.125 + p = -2.053198724 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + p = -2.053198724 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + p = -2.053198724 + -0.125 p = -2.053198724 + -0.125 Combine like terms: -2.053198724 + -0.125 = -2.178198724 p = -2.178198724 Simplifying p = -2.178198724

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.928198724, -2.178198724}

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