5p^2-4p-4=0

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Solution for 5p^2-4p-4=0 equation:


Simplifying
5p2 + -4p + -4 = 0

Reorder the terms:
-4 + -4p + 5p2 = 0

Solving
-4 + -4p + 5p2 = 0

Solving for variable 'p'.

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

Divide each side by '5'.
-0.8 + -0.8p + p2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -0.8p + 0.8 + p2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -0.8p + p2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -0.8p + p2 = 0 + 0.8
-0.8p + p2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-0.8p + p2 = 0.8

The p term is -0.8p.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8p + 0.16 + p2 = 0.8 + 0.16

Reorder the terms:
0.16 + -0.8p + p2 = 0.8 + 0.16

Combine like terms: 0.8 + 0.16 = 0.96
0.16 + -0.8p + p2 = 0.96

Factor a perfect square on the left side:
(p + -0.4)(p + -0.4) = 0.96

Calculate the square root of the right side: 0.979795897

Break this problem into two subproblems by setting 
(p + -0.4) equal to 0.979795897 and -0.979795897.

Subproblem 1

p + -0.4 = 0.979795897 Simplifying p + -0.4 = 0.979795897 Reorder the terms: -0.4 + p = 0.979795897 Solving -0.4 + p = 0.979795897 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + p = 0.979795897 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + p = 0.979795897 + 0.4 p = 0.979795897 + 0.4 Combine like terms: 0.979795897 + 0.4 = 1.379795897 p = 1.379795897 Simplifying p = 1.379795897

Subproblem 2

p + -0.4 = -0.979795897 Simplifying p + -0.4 = -0.979795897 Reorder the terms: -0.4 + p = -0.979795897 Solving -0.4 + p = -0.979795897 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + p = -0.979795897 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + p = -0.979795897 + 0.4 p = -0.979795897 + 0.4 Combine like terms: -0.979795897 + 0.4 = -0.579795897 p = -0.579795897 Simplifying p = -0.579795897

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.379795897, -0.579795897}

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