-4p^2-6p+15=0

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Solution for -4p^2-6p+15=0 equation:


Simplifying
-4p2 + -6p + 15 = 0

Reorder the terms:
15 + -6p + -4p2 = 0

Solving
15 + -6p + -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'.
-3.75 + 1.5p + p2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + 1.5p + 3.75 + p2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + 1.5p + p2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + 1.5p + p2 = 0 + 3.75
1.5p + p2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
1.5p + p2 = 3.75

The p term is 1.5p.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5p + 0.5625 + p2 = 3.75 + 0.5625

Reorder the terms:
0.5625 + 1.5p + p2 = 3.75 + 0.5625

Combine like terms: 3.75 + 0.5625 = 4.3125
0.5625 + 1.5p + p2 = 4.3125

Factor a perfect square on the left side:
(p + 0.75)(p + 0.75) = 4.3125

Calculate the square root of the right side: 2.076655966

Break this problem into two subproblems by setting 
(p + 0.75) equal to 2.076655966 and -2.076655966.

Subproblem 1

p + 0.75 = 2.076655966 Simplifying p + 0.75 = 2.076655966 Reorder the terms: 0.75 + p = 2.076655966 Solving 0.75 + p = 2.076655966 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + p = 2.076655966 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + p = 2.076655966 + -0.75 p = 2.076655966 + -0.75 Combine like terms: 2.076655966 + -0.75 = 1.326655966 p = 1.326655966 Simplifying p = 1.326655966

Subproblem 2

p + 0.75 = -2.076655966 Simplifying p + 0.75 = -2.076655966 Reorder the terms: 0.75 + p = -2.076655966 Solving 0.75 + p = -2.076655966 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + p = -2.076655966 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + p = -2.076655966 + -0.75 p = -2.076655966 + -0.75 Combine like terms: -2.076655966 + -0.75 = -2.826655966 p = -2.826655966 Simplifying p = -2.826655966

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.326655966, -2.826655966}

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