5p^2-7p-16=0

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Solution for 5p^2-7p-16=0 equation:


Simplifying
5p2 + -7p + -16 = 0

Reorder the terms:
-16 + -7p + 5p2 = 0

Solving
-16 + -7p + 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'.
-3.2 + -1.4p + p2 = 0

Move the constant term to the right:

Add '3.2' to each side of the equation.
-3.2 + -1.4p + 3.2 + p2 = 0 + 3.2

Reorder the terms:
-3.2 + 3.2 + -1.4p + p2 = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + -1.4p + p2 = 0 + 3.2
-1.4p + p2 = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
-1.4p + p2 = 3.2

The p term is -1.4p.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4p + 0.49 + p2 = 3.2 + 0.49

Reorder the terms:
0.49 + -1.4p + p2 = 3.2 + 0.49

Combine like terms: 3.2 + 0.49 = 3.69
0.49 + -1.4p + p2 = 3.69

Factor a perfect square on the left side:
(p + -0.7)(p + -0.7) = 3.69

Calculate the square root of the right side: 1.920937271

Break this problem into two subproblems by setting 
(p + -0.7) equal to 1.920937271 and -1.920937271.

Subproblem 1

p + -0.7 = 1.920937271 Simplifying p + -0.7 = 1.920937271 Reorder the terms: -0.7 + p = 1.920937271 Solving -0.7 + p = 1.920937271 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + p = 1.920937271 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + p = 1.920937271 + 0.7 p = 1.920937271 + 0.7 Combine like terms: 1.920937271 + 0.7 = 2.620937271 p = 2.620937271 Simplifying p = 2.620937271

Subproblem 2

p + -0.7 = -1.920937271 Simplifying p + -0.7 = -1.920937271 Reorder the terms: -0.7 + p = -1.920937271 Solving -0.7 + p = -1.920937271 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + p = -1.920937271 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + p = -1.920937271 + 0.7 p = -1.920937271 + 0.7 Combine like terms: -1.920937271 + 0.7 = -1.220937271 p = -1.220937271 Simplifying p = -1.220937271

Solution

The solution to the problem is based on the solutions from the subproblems. p = {2.620937271, -1.220937271}

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