p^2-20p-40=5

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Solution for p^2-20p-40=5 equation:


Simplifying
p2 + -20p + -40 = 5

Reorder the terms:
-40 + -20p + p2 = 5

Solving
-40 + -20p + p2 = 5

Solving for variable 'p'.

Reorder the terms:
-40 + -5 + -20p + p2 = 5 + -5

Combine like terms: -40 + -5 = -45
-45 + -20p + p2 = 5 + -5

Combine like terms: 5 + -5 = 0
-45 + -20p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + -20p + 45 + p2 = 0 + 45

Reorder the terms:
-45 + 45 + -20p + p2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -20p + p2 = 0 + 45
-20p + p2 = 0 + 45

Combine like terms: 0 + 45 = 45
-20p + p2 = 45

The p term is -20p.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20p + 100 + p2 = 45 + 100

Reorder the terms:
100 + -20p + p2 = 45 + 100

Combine like terms: 45 + 100 = 145
100 + -20p + p2 = 145

Factor a perfect square on the left side:
(p + -10)(p + -10) = 145

Calculate the square root of the right side: 12.041594579

Break this problem into two subproblems by setting 
(p + -10) equal to 12.041594579 and -12.041594579.

Subproblem 1

p + -10 = 12.041594579 Simplifying p + -10 = 12.041594579 Reorder the terms: -10 + p = 12.041594579 Solving -10 + p = 12.041594579 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + p = 12.041594579 + 10 Combine like terms: -10 + 10 = 0 0 + p = 12.041594579 + 10 p = 12.041594579 + 10 Combine like terms: 12.041594579 + 10 = 22.041594579 p = 22.041594579 Simplifying p = 22.041594579

Subproblem 2

p + -10 = -12.041594579 Simplifying p + -10 = -12.041594579 Reorder the terms: -10 + p = -12.041594579 Solving -10 + p = -12.041594579 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + p = -12.041594579 + 10 Combine like terms: -10 + 10 = 0 0 + p = -12.041594579 + 10 p = -12.041594579 + 10 Combine like terms: -12.041594579 + 10 = -2.041594579 p = -2.041594579 Simplifying p = -2.041594579

Solution

The solution to the problem is based on the solutions from the subproblems. p = {22.041594579, -2.041594579}

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