p^2-5p-20=0

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


Simplifying
p2 + -5p + -20 = 0

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

Solving
-20 + -5p + p2 = 0

Solving for variable 'p'.

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -5p + 20 + p2 = 0 + 20

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

Combine like terms: -20 + 20 = 0
0 + -5p + p2 = 0 + 20
-5p + p2 = 0 + 20

Combine like terms: 0 + 20 = 20
-5p + p2 = 20

The p term is -5p.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5p + 6.25 + p2 = 20 + 6.25

Reorder the terms:
6.25 + -5p + p2 = 20 + 6.25

Combine like terms: 20 + 6.25 = 26.25
6.25 + -5p + p2 = 26.25

Factor a perfect square on the left side:
(p + -2.5)(p + -2.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(p + -2.5) equal to 5.123475383 and -5.123475383.

Subproblem 1

p + -2.5 = 5.123475383 Simplifying p + -2.5 = 5.123475383 Reorder the terms: -2.5 + p = 5.123475383 Solving -2.5 + p = 5.123475383 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + p = 5.123475383 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + p = 5.123475383 + 2.5 p = 5.123475383 + 2.5 Combine like terms: 5.123475383 + 2.5 = 7.623475383 p = 7.623475383 Simplifying p = 7.623475383

Subproblem 2

p + -2.5 = -5.123475383 Simplifying p + -2.5 = -5.123475383 Reorder the terms: -2.5 + p = -5.123475383 Solving -2.5 + p = -5.123475383 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + p = -5.123475383 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + p = -5.123475383 + 2.5 p = -5.123475383 + 2.5 Combine like terms: -5.123475383 + 2.5 = -2.623475383 p = -2.623475383 Simplifying p = -2.623475383

Solution

The solution to the problem is based on the solutions from the subproblems. p = {7.623475383, -2.623475383}

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