4p^2+15p-19=9

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Solution for 4p^2+15p-19=9 equation:


Simplifying
4p2 + 15p + -19 = 9

Reorder the terms:
-19 + 15p + 4p2 = 9

Solving
-19 + 15p + 4p2 = 9

Solving for variable 'p'.

Reorder the terms:
-19 + -9 + 15p + 4p2 = 9 + -9

Combine like terms: -19 + -9 = -28
-28 + 15p + 4p2 = 9 + -9

Combine like terms: 9 + -9 = 0
-28 + 15p + 4p2 = 0

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

Divide each side by '4'.
-7 + 3.75p + p2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 3.75p + 7 + p2 = 0 + 7

Reorder the terms:
-7 + 7 + 3.75p + p2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 3.75p + p2 = 0 + 7
3.75p + p2 = 0 + 7

Combine like terms: 0 + 7 = 7
3.75p + p2 = 7

The p term is 3.75p.  Take half its coefficient (1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
3.75p + 3.515625 + p2 = 7 + 3.515625

Reorder the terms:
3.515625 + 3.75p + p2 = 7 + 3.515625

Combine like terms: 7 + 3.515625 = 10.515625
3.515625 + 3.75p + p2 = 10.515625

Factor a perfect square on the left side:
(p + 1.875)(p + 1.875) = 10.515625

Calculate the square root of the right side: 3.242780443

Break this problem into two subproblems by setting 
(p + 1.875) equal to 3.242780443 and -3.242780443.

Subproblem 1

p + 1.875 = 3.242780443 Simplifying p + 1.875 = 3.242780443 Reorder the terms: 1.875 + p = 3.242780443 Solving 1.875 + p = 3.242780443 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + p = 3.242780443 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + p = 3.242780443 + -1.875 p = 3.242780443 + -1.875 Combine like terms: 3.242780443 + -1.875 = 1.367780443 p = 1.367780443 Simplifying p = 1.367780443

Subproblem 2

p + 1.875 = -3.242780443 Simplifying p + 1.875 = -3.242780443 Reorder the terms: 1.875 + p = -3.242780443 Solving 1.875 + p = -3.242780443 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + p = -3.242780443 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + p = -3.242780443 + -1.875 p = -3.242780443 + -1.875 Combine like terms: -3.242780443 + -1.875 = -5.117780443 p = -5.117780443 Simplifying p = -5.117780443

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.367780443, -5.117780443}

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