2p^2-12p-15=0

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Solution for 2p^2-12p-15=0 equation:


Simplifying
2p2 + -12p + -15 = 0

Reorder the terms:
-15 + -12p + 2p2 = 0

Solving
-15 + -12p + 2p2 = 0

Solving for variable 'p'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-7.5 + -6p + p2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + -6p + 7.5 + p2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + -6p + p2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + -6p + p2 = 0 + 7.5
-6p + p2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
-6p + p2 = 7.5

The p term is -6p.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6p + 9 + p2 = 7.5 + 9

Reorder the terms:
9 + -6p + p2 = 7.5 + 9

Combine like terms: 7.5 + 9 = 16.5
9 + -6p + p2 = 16.5

Factor a perfect square on the left side:
(p + -3)(p + -3) = 16.5

Calculate the square root of the right side: 4.062019202

Break this problem into two subproblems by setting 
(p + -3) equal to 4.062019202 and -4.062019202.

Subproblem 1

p + -3 = 4.062019202 Simplifying p + -3 = 4.062019202 Reorder the terms: -3 + p = 4.062019202 Solving -3 + p = 4.062019202 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + p = 4.062019202 + 3 Combine like terms: -3 + 3 = 0 0 + p = 4.062019202 + 3 p = 4.062019202 + 3 Combine like terms: 4.062019202 + 3 = 7.062019202 p = 7.062019202 Simplifying p = 7.062019202

Subproblem 2

p + -3 = -4.062019202 Simplifying p + -3 = -4.062019202 Reorder the terms: -3 + p = -4.062019202 Solving -3 + p = -4.062019202 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + p = -4.062019202 + 3 Combine like terms: -3 + 3 = 0 0 + p = -4.062019202 + 3 p = -4.062019202 + 3 Combine like terms: -4.062019202 + 3 = -1.062019202 p = -1.062019202 Simplifying p = -1.062019202

Solution

The solution to the problem is based on the solutions from the subproblems. p = {7.062019202, -1.062019202}

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