p^2-13p=.40

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Solution for p^2-13p=.40 equation:


Simplifying
p2 + -13p = 0.40

Reorder the terms:
-13p + p2 = 0.40

Solving
-13p + p2 = 0.40

Solving for variable 'p'.

Reorder the terms:
-0.40 + -13p + p2 = 0.40 + -0.40

Combine like terms: 0.40 + -0.40 = 0.00
-0.40 + -13p + p2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '0.40' to each side of the equation.
-0.40 + -13p + 0.40 + p2 = 0.00 + 0.40

Reorder the terms:
-0.40 + 0.40 + -13p + p2 = 0.00 + 0.40

Combine like terms: -0.40 + 0.40 = 0.00
0.00 + -13p + p2 = 0.00 + 0.40
-13p + p2 = 0.00 + 0.40

Combine like terms: 0.00 + 0.40 = 0.4
-13p + p2 = 0.4

The p term is -13p.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13p + 42.25 + p2 = 0.4 + 42.25

Reorder the terms:
42.25 + -13p + p2 = 0.4 + 42.25

Combine like terms: 0.4 + 42.25 = 42.65
42.25 + -13p + p2 = 42.65

Factor a perfect square on the left side:
(p + -6.5)(p + -6.5) = 42.65

Calculate the square root of the right side: 6.530696747

Break this problem into two subproblems by setting 
(p + -6.5) equal to 6.530696747 and -6.530696747.

Subproblem 1

p + -6.5 = 6.530696747 Simplifying p + -6.5 = 6.530696747 Reorder the terms: -6.5 + p = 6.530696747 Solving -6.5 + p = 6.530696747 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + p = 6.530696747 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + p = 6.530696747 + 6.5 p = 6.530696747 + 6.5 Combine like terms: 6.530696747 + 6.5 = 13.030696747 p = 13.030696747 Simplifying p = 13.030696747

Subproblem 2

p + -6.5 = -6.530696747 Simplifying p + -6.5 = -6.530696747 Reorder the terms: -6.5 + p = -6.530696747 Solving -6.5 + p = -6.530696747 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + p = -6.530696747 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + p = -6.530696747 + 6.5 p = -6.530696747 + 6.5 Combine like terms: -6.530696747 + 6.5 = -0.030696747 p = -0.030696747 Simplifying p = -0.030696747

Solution

The solution to the problem is based on the solutions from the subproblems. p = {13.030696747, -0.030696747}

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