2p^2+7=-8p

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Solution for 2p^2+7=-8p equation:


Simplifying
2p2 + 7 = -8p

Reorder the terms:
7 + 2p2 = -8p

Solving
7 + 2p2 = -8p

Solving for variable 'p'.

Reorder the terms:
7 + 8p + 2p2 = -8p + 8p

Combine like terms: -8p + 8p = 0
7 + 8p + 2p2 = 0

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

Divide each side by '2'.
3.5 + 4p + p2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + 4p + -3.5 + p2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + 4p + p2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + 4p + p2 = 0 + -3.5
4p + p2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
4p + p2 = -3.5

The p term is 4p.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4p + 4 + p2 = -3.5 + 4

Reorder the terms:
4 + 4p + p2 = -3.5 + 4

Combine like terms: -3.5 + 4 = 0.5
4 + 4p + p2 = 0.5

Factor a perfect square on the left side:
(p + 2)(p + 2) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(p + 2) equal to 0.707106781 and -0.707106781.

Subproblem 1

p + 2 = 0.707106781 Simplifying p + 2 = 0.707106781 Reorder the terms: 2 + p = 0.707106781 Solving 2 + p = 0.707106781 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + p = 0.707106781 + -2 Combine like terms: 2 + -2 = 0 0 + p = 0.707106781 + -2 p = 0.707106781 + -2 Combine like terms: 0.707106781 + -2 = -1.292893219 p = -1.292893219 Simplifying p = -1.292893219

Subproblem 2

p + 2 = -0.707106781 Simplifying p + 2 = -0.707106781 Reorder the terms: 2 + p = -0.707106781 Solving 2 + p = -0.707106781 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + p = -0.707106781 + -2 Combine like terms: 2 + -2 = 0 0 + p = -0.707106781 + -2 p = -0.707106781 + -2 Combine like terms: -0.707106781 + -2 = -2.707106781 p = -2.707106781 Simplifying p = -2.707106781

Solution

The solution to the problem is based on the solutions from the subproblems. p = {-1.292893219, -2.707106781}

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