4p^2+9p-5=0

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Solution for 4p^2+9p-5=0 equation:


Simplifying
4p2 + 9p + -5 = 0

Reorder the terms:
-5 + 9p + 4p2 = 0

Solving
-5 + 9p + 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'.
-1.25 + 2.25p + p2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 2.25p + 1.25 + p2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 2.25p + p2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 2.25p + p2 = 0 + 1.25
2.25p + p2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
2.25p + p2 = 1.25

The p term is 2.25p.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25p + 1.265625 + p2 = 1.25 + 1.265625

Reorder the terms:
1.265625 + 2.25p + p2 = 1.25 + 1.265625

Combine like terms: 1.25 + 1.265625 = 2.515625
1.265625 + 2.25p + p2 = 2.515625

Factor a perfect square on the left side:
(p + 1.125)(p + 1.125) = 2.515625

Calculate the square root of the right side: 1.586072193

Break this problem into two subproblems by setting 
(p + 1.125) equal to 1.586072193 and -1.586072193.

Subproblem 1

p + 1.125 = 1.586072193 Simplifying p + 1.125 = 1.586072193 Reorder the terms: 1.125 + p = 1.586072193 Solving 1.125 + p = 1.586072193 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + p = 1.586072193 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + p = 1.586072193 + -1.125 p = 1.586072193 + -1.125 Combine like terms: 1.586072193 + -1.125 = 0.461072193 p = 0.461072193 Simplifying p = 0.461072193

Subproblem 2

p + 1.125 = -1.586072193 Simplifying p + 1.125 = -1.586072193 Reorder the terms: 1.125 + p = -1.586072193 Solving 1.125 + p = -1.586072193 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + p = -1.586072193 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + p = -1.586072193 + -1.125 p = -1.586072193 + -1.125 Combine like terms: -1.586072193 + -1.125 = -2.711072193 p = -2.711072193 Simplifying p = -2.711072193

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.461072193, -2.711072193}

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