15p^2-2p-1=7p^2+6+3p

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Solution for 15p^2-2p-1=7p^2+6+3p equation:


Simplifying
15p2 + -2p + -1 = 7p2 + 6 + 3p

Reorder the terms:
-1 + -2p + 15p2 = 7p2 + 6 + 3p

Reorder the terms:
-1 + -2p + 15p2 = 6 + 3p + 7p2

Solving
-1 + -2p + 15p2 = 6 + 3p + 7p2

Solving for variable 'p'.

Reorder the terms:
-1 + -6 + -2p + -3p + 15p2 + -7p2 = 6 + 3p + 7p2 + -6 + -3p + -7p2

Combine like terms: -1 + -6 = -7
-7 + -2p + -3p + 15p2 + -7p2 = 6 + 3p + 7p2 + -6 + -3p + -7p2

Combine like terms: -2p + -3p = -5p
-7 + -5p + 15p2 + -7p2 = 6 + 3p + 7p2 + -6 + -3p + -7p2

Combine like terms: 15p2 + -7p2 = 8p2
-7 + -5p + 8p2 = 6 + 3p + 7p2 + -6 + -3p + -7p2

Reorder the terms:
-7 + -5p + 8p2 = 6 + -6 + 3p + -3p + 7p2 + -7p2

Combine like terms: 6 + -6 = 0
-7 + -5p + 8p2 = 0 + 3p + -3p + 7p2 + -7p2
-7 + -5p + 8p2 = 3p + -3p + 7p2 + -7p2

Combine like terms: 3p + -3p = 0
-7 + -5p + 8p2 = 0 + 7p2 + -7p2
-7 + -5p + 8p2 = 7p2 + -7p2

Combine like terms: 7p2 + -7p2 = 0
-7 + -5p + 8p2 = 0

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

Divide each side by '8'.
-0.875 + -0.625p + p2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + -0.625p + 0.875 + p2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + -0.625p + p2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + -0.625p + p2 = 0 + 0.875
-0.625p + p2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
-0.625p + p2 = 0.875

The p term is -0.625p.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625p + 0.09765625 + p2 = 0.875 + 0.09765625

Reorder the terms:
0.09765625 + -0.625p + p2 = 0.875 + 0.09765625

Combine like terms: 0.875 + 0.09765625 = 0.97265625
0.09765625 + -0.625p + p2 = 0.97265625

Factor a perfect square on the left side:
(p + -0.3125)(p + -0.3125) = 0.97265625

Calculate the square root of the right side: 0.986233365

Break this problem into two subproblems by setting 
(p + -0.3125) equal to 0.986233365 and -0.986233365.

Subproblem 1

p + -0.3125 = 0.986233365 Simplifying p + -0.3125 = 0.986233365 Reorder the terms: -0.3125 + p = 0.986233365 Solving -0.3125 + p = 0.986233365 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + p = 0.986233365 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + p = 0.986233365 + 0.3125 p = 0.986233365 + 0.3125 Combine like terms: 0.986233365 + 0.3125 = 1.298733365 p = 1.298733365 Simplifying p = 1.298733365

Subproblem 2

p + -0.3125 = -0.986233365 Simplifying p + -0.3125 = -0.986233365 Reorder the terms: -0.3125 + p = -0.986233365 Solving -0.3125 + p = -0.986233365 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + p = -0.986233365 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + p = -0.986233365 + 0.3125 p = -0.986233365 + 0.3125 Combine like terms: -0.986233365 + 0.3125 = -0.673733365 p = -0.673733365 Simplifying p = -0.673733365

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.298733365, -0.673733365}

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