2p^2-16p-7=0

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Solution for 2p^2-16p-7=0 equation:


Simplifying
2p2 + -16p + -7 = 0

Reorder the terms:
-7 + -16p + 2p2 = 0

Solving
-7 + -16p + 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'.
-3.5 + -8p + p2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -8p + 3.5 + p2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -8p + p2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -8p + p2 = 0 + 3.5
-8p + p2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-8p + p2 = 3.5

The p term is -8p.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8p + 16 + p2 = 3.5 + 16

Reorder the terms:
16 + -8p + p2 = 3.5 + 16

Combine like terms: 3.5 + 16 = 19.5
16 + -8p + p2 = 19.5

Factor a perfect square on the left side:
(p + -4)(p + -4) = 19.5

Calculate the square root of the right side: 4.415880433

Break this problem into two subproblems by setting 
(p + -4) equal to 4.415880433 and -4.415880433.

Subproblem 1

p + -4 = 4.415880433 Simplifying p + -4 = 4.415880433 Reorder the terms: -4 + p = 4.415880433 Solving -4 + p = 4.415880433 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + p = 4.415880433 + 4 Combine like terms: -4 + 4 = 0 0 + p = 4.415880433 + 4 p = 4.415880433 + 4 Combine like terms: 4.415880433 + 4 = 8.415880433 p = 8.415880433 Simplifying p = 8.415880433

Subproblem 2

p + -4 = -4.415880433 Simplifying p + -4 = -4.415880433 Reorder the terms: -4 + p = -4.415880433 Solving -4 + p = -4.415880433 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + p = -4.415880433 + 4 Combine like terms: -4 + 4 = 0 0 + p = -4.415880433 + 4 p = -4.415880433 + 4 Combine like terms: -4.415880433 + 4 = -0.415880433 p = -0.415880433 Simplifying p = -0.415880433

Solution

The solution to the problem is based on the solutions from the subproblems. p = {8.415880433, -0.415880433}

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