4p^2+16p=15

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Solution for 4p^2+16p=15 equation:


Simplifying
4p2 + 16p = 15

Reorder the terms:
16p + 4p2 = 15

Solving
16p + 4p2 = 15

Solving for variable 'p'.

Reorder the terms:
-15 + 16p + 4p2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 16p + 4p2 = 0

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

Divide each side by '4'.
-3.75 + 4p + p2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + 4p + 3.75 + p2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + 4p + p2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + 4p + p2 = 0 + 3.75
4p + p2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
4p + p2 = 3.75

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 = 3.75 + 4

Reorder the terms:
4 + 4p + p2 = 3.75 + 4

Combine like terms: 3.75 + 4 = 7.75
4 + 4p + p2 = 7.75

Factor a perfect square on the left side:
(p + 2)(p + 2) = 7.75

Calculate the square root of the right side: 2.783882181

Break this problem into two subproblems by setting 
(p + 2) equal to 2.783882181 and -2.783882181.

Subproblem 1

p + 2 = 2.783882181 Simplifying p + 2 = 2.783882181 Reorder the terms: 2 + p = 2.783882181 Solving 2 + p = 2.783882181 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 = 2.783882181 + -2 Combine like terms: 2 + -2 = 0 0 + p = 2.783882181 + -2 p = 2.783882181 + -2 Combine like terms: 2.783882181 + -2 = 0.783882181 p = 0.783882181 Simplifying p = 0.783882181

Subproblem 2

p + 2 = -2.783882181 Simplifying p + 2 = -2.783882181 Reorder the terms: 2 + p = -2.783882181 Solving 2 + p = -2.783882181 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 = -2.783882181 + -2 Combine like terms: 2 + -2 = 0 0 + p = -2.783882181 + -2 p = -2.783882181 + -2 Combine like terms: -2.783882181 + -2 = -4.783882181 p = -4.783882181 Simplifying p = -4.783882181

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.783882181, -4.783882181}

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