5p^2-8p-12=-5

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Solution for 5p^2-8p-12=-5 equation:


Simplifying
5p2 + -8p + -12 = -5

Reorder the terms:
-12 + -8p + 5p2 = -5

Solving
-12 + -8p + 5p2 = -5

Solving for variable 'p'.

Reorder the terms:
-12 + 5 + -8p + 5p2 = -5 + 5

Combine like terms: -12 + 5 = -7
-7 + -8p + 5p2 = -5 + 5

Combine like terms: -5 + 5 = 0
-7 + -8p + 5p2 = 0

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

Divide each side by '5'.
-1.4 + -1.6p + p2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + -1.6p + 1.4 + p2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + -1.6p + p2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + -1.6p + p2 = 0 + 1.4
-1.6p + p2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
-1.6p + p2 = 1.4

The p term is -1.6p.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6p + 0.64 + p2 = 1.4 + 0.64

Reorder the terms:
0.64 + -1.6p + p2 = 1.4 + 0.64

Combine like terms: 1.4 + 0.64 = 2.04
0.64 + -1.6p + p2 = 2.04

Factor a perfect square on the left side:
(p + -0.8)(p + -0.8) = 2.04

Calculate the square root of the right side: 1.428285686

Break this problem into two subproblems by setting 
(p + -0.8) equal to 1.428285686 and -1.428285686.

Subproblem 1

p + -0.8 = 1.428285686 Simplifying p + -0.8 = 1.428285686 Reorder the terms: -0.8 + p = 1.428285686 Solving -0.8 + p = 1.428285686 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + p = 1.428285686 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + p = 1.428285686 + 0.8 p = 1.428285686 + 0.8 Combine like terms: 1.428285686 + 0.8 = 2.228285686 p = 2.228285686 Simplifying p = 2.228285686

Subproblem 2

p + -0.8 = -1.428285686 Simplifying p + -0.8 = -1.428285686 Reorder the terms: -0.8 + p = -1.428285686 Solving -0.8 + p = -1.428285686 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + p = -1.428285686 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + p = -1.428285686 + 0.8 p = -1.428285686 + 0.8 Combine like terms: -1.428285686 + 0.8 = -0.628285686 p = -0.628285686 Simplifying p = -0.628285686

Solution

The solution to the problem is based on the solutions from the subproblems. p = {2.228285686, -0.628285686}

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