p^2-3p=8

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Solution for p^2-3p=8 equation:


Simplifying
p2 + -3p = 8

Reorder the terms:
-3p + p2 = 8

Solving
-3p + p2 = 8

Solving for variable 'p'.

Reorder the terms:
-8 + -3p + p2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + -3p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -3p + 8 + p2 = 0 + 8

Reorder the terms:
-8 + 8 + -3p + p2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -3p + p2 = 0 + 8
-3p + p2 = 0 + 8

Combine like terms: 0 + 8 = 8
-3p + p2 = 8

The p term is -3p.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3p + 2.25 + p2 = 8 + 2.25

Reorder the terms:
2.25 + -3p + p2 = 8 + 2.25

Combine like terms: 8 + 2.25 = 10.25
2.25 + -3p + p2 = 10.25

Factor a perfect square on the left side:
(p + -1.5)(p + -1.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(p + -1.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

p + -1.5 = 3.201562119 Simplifying p + -1.5 = 3.201562119 Reorder the terms: -1.5 + p = 3.201562119 Solving -1.5 + p = 3.201562119 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + p = 3.201562119 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + p = 3.201562119 + 1.5 p = 3.201562119 + 1.5 Combine like terms: 3.201562119 + 1.5 = 4.701562119 p = 4.701562119 Simplifying p = 4.701562119

Subproblem 2

p + -1.5 = -3.201562119 Simplifying p + -1.5 = -3.201562119 Reorder the terms: -1.5 + p = -3.201562119 Solving -1.5 + p = -3.201562119 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + p = -3.201562119 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + p = -3.201562119 + 1.5 p = -3.201562119 + 1.5 Combine like terms: -3.201562119 + 1.5 = -1.701562119 p = -1.701562119 Simplifying p = -1.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. p = {4.701562119, -1.701562119}

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