2p^2+10p-9=0

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Solution for 2p^2+10p-9=0 equation:


Simplifying
2p2 + 10p + -9 = 0

Reorder the terms:
-9 + 10p + 2p2 = 0

Solving
-9 + 10p + 2p2 = 0

Solving for variable 'p'.

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

Divide each side by '2'.
-4.5 + 5p + p2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 5p + 4.5 + p2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 5p + p2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 5p + p2 = 0 + 4.5
5p + p2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
5p + p2 = 4.5

The p term is 5p.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5p + 6.25 + p2 = 4.5 + 6.25

Reorder the terms:
6.25 + 5p + p2 = 4.5 + 6.25

Combine like terms: 4.5 + 6.25 = 10.75
6.25 + 5p + p2 = 10.75

Factor a perfect square on the left side:
(p + 2.5)(p + 2.5) = 10.75

Calculate the square root of the right side: 3.278719262

Break this problem into two subproblems by setting 
(p + 2.5) equal to 3.278719262 and -3.278719262.

Subproblem 1

p + 2.5 = 3.278719262 Simplifying p + 2.5 = 3.278719262 Reorder the terms: 2.5 + p = 3.278719262 Solving 2.5 + p = 3.278719262 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + p = 3.278719262 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + p = 3.278719262 + -2.5 p = 3.278719262 + -2.5 Combine like terms: 3.278719262 + -2.5 = 0.778719262 p = 0.778719262 Simplifying p = 0.778719262

Subproblem 2

p + 2.5 = -3.278719262 Simplifying p + 2.5 = -3.278719262 Reorder the terms: 2.5 + p = -3.278719262 Solving 2.5 + p = -3.278719262 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + p = -3.278719262 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + p = -3.278719262 + -2.5 p = -3.278719262 + -2.5 Combine like terms: -3.278719262 + -2.5 = -5.778719262 p = -5.778719262 Simplifying p = -5.778719262

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.778719262, -5.778719262}

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