4p^2-p-400=0

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Solution for 4p^2-p-400=0 equation:


Simplifying
4p2 + -1p + -400 = 0

Reorder the terms:
-400 + -1p + 4p2 = 0

Solving
-400 + -1p + 4p2 = 0

Solving for variable 'p'.

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

Divide each side by '4'.
-100 + -0.25p + p2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -0.25p + 100 + p2 = 0 + 100

Reorder the terms:
-100 + 100 + -0.25p + p2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -0.25p + p2 = 0 + 100
-0.25p + p2 = 0 + 100

Combine like terms: 0 + 100 = 100
-0.25p + p2 = 100

The p term is -0.25p.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25p + 0.015625 + p2 = 100 + 0.015625

Reorder the terms:
0.015625 + -0.25p + p2 = 100 + 0.015625

Combine like terms: 100 + 0.015625 = 100.015625
0.015625 + -0.25p + p2 = 100.015625

Factor a perfect square on the left side:
(p + -0.125)(p + -0.125) = 100.015625

Calculate the square root of the right side: 10.000781219

Break this problem into two subproblems by setting 
(p + -0.125) equal to 10.000781219 and -10.000781219.

Subproblem 1

p + -0.125 = 10.000781219 Simplifying p + -0.125 = 10.000781219 Reorder the terms: -0.125 + p = 10.000781219 Solving -0.125 + p = 10.000781219 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + p = 10.000781219 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + p = 10.000781219 + 0.125 p = 10.000781219 + 0.125 Combine like terms: 10.000781219 + 0.125 = 10.125781219 p = 10.125781219 Simplifying p = 10.125781219

Subproblem 2

p + -0.125 = -10.000781219 Simplifying p + -0.125 = -10.000781219 Reorder the terms: -0.125 + p = -10.000781219 Solving -0.125 + p = -10.000781219 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + p = -10.000781219 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + p = -10.000781219 + 0.125 p = -10.000781219 + 0.125 Combine like terms: -10.000781219 + 0.125 = -9.875781219 p = -9.875781219 Simplifying p = -9.875781219

Solution

The solution to the problem is based on the solutions from the subproblems. p = {10.125781219, -9.875781219}

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