10p^2+9p-45=0

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Solution for 10p^2+9p-45=0 equation:


Simplifying
10p2 + 9p + -45 = 0

Reorder the terms:
-45 + 9p + 10p2 = 0

Solving
-45 + 9p + 10p2 = 0

Solving for variable 'p'.

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

Divide each side by '10'.
-4.5 + 0.9p + p2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 0.9p + 4.5 + p2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 0.9p + p2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 0.9p + p2 = 0 + 4.5
0.9p + p2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
0.9p + p2 = 4.5

The p term is 0.9p.  Take half its coefficient (0.45).
Square it (0.2025) and add it to both sides.

Add '0.2025' to each side of the equation.
0.9p + 0.2025 + p2 = 4.5 + 0.2025

Reorder the terms:
0.2025 + 0.9p + p2 = 4.5 + 0.2025

Combine like terms: 4.5 + 0.2025 = 4.7025
0.2025 + 0.9p + p2 = 4.7025

Factor a perfect square on the left side:
(p + 0.45)(p + 0.45) = 4.7025

Calculate the square root of the right side: 2.168524844

Break this problem into two subproblems by setting 
(p + 0.45) equal to 2.168524844 and -2.168524844.

Subproblem 1

p + 0.45 = 2.168524844 Simplifying p + 0.45 = 2.168524844 Reorder the terms: 0.45 + p = 2.168524844 Solving 0.45 + p = 2.168524844 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.45' to each side of the equation. 0.45 + -0.45 + p = 2.168524844 + -0.45 Combine like terms: 0.45 + -0.45 = 0.00 0.00 + p = 2.168524844 + -0.45 p = 2.168524844 + -0.45 Combine like terms: 2.168524844 + -0.45 = 1.718524844 p = 1.718524844 Simplifying p = 1.718524844

Subproblem 2

p + 0.45 = -2.168524844 Simplifying p + 0.45 = -2.168524844 Reorder the terms: 0.45 + p = -2.168524844 Solving 0.45 + p = -2.168524844 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.45' to each side of the equation. 0.45 + -0.45 + p = -2.168524844 + -0.45 Combine like terms: 0.45 + -0.45 = 0.00 0.00 + p = -2.168524844 + -0.45 p = -2.168524844 + -0.45 Combine like terms: -2.168524844 + -0.45 = -2.618524844 p = -2.618524844 Simplifying p = -2.618524844

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.718524844, -2.618524844}

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