2p^2=-9p+2

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


Simplifying
2p2 = -9p + 2

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

Solving
2p2 = 2 + -9p

Solving for variable 'p'.

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

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

Combine like terms: 2 + -2 = 0
-2 + 9p + 2p2 = 0 + -9p + 9p
-2 + 9p + 2p2 = -9p + 9p

Combine like terms: -9p + 9p = 0
-2 + 9p + 2p2 = 0

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

Divide each side by '2'.
-1 + 4.5p + p2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 4.5p + 1 + p2 = 0 + 1

Reorder the terms:
-1 + 1 + 4.5p + p2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 4.5p + p2 = 0 + 1
4.5p + p2 = 0 + 1

Combine like terms: 0 + 1 = 1
4.5p + p2 = 1

The p term is 4.5p.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5p + 5.0625 + p2 = 1 + 5.0625

Reorder the terms:
5.0625 + 4.5p + p2 = 1 + 5.0625

Combine like terms: 1 + 5.0625 = 6.0625
5.0625 + 4.5p + p2 = 6.0625

Factor a perfect square on the left side:
(p + 2.25)(p + 2.25) = 6.0625

Calculate the square root of the right side: 2.46221445

Break this problem into two subproblems by setting 
(p + 2.25) equal to 2.46221445 and -2.46221445.

Subproblem 1

p + 2.25 = 2.46221445 Simplifying p + 2.25 = 2.46221445 Reorder the terms: 2.25 + p = 2.46221445 Solving 2.25 + p = 2.46221445 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + p = 2.46221445 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + p = 2.46221445 + -2.25 p = 2.46221445 + -2.25 Combine like terms: 2.46221445 + -2.25 = 0.21221445 p = 0.21221445 Simplifying p = 0.21221445

Subproblem 2

p + 2.25 = -2.46221445 Simplifying p + 2.25 = -2.46221445 Reorder the terms: 2.25 + p = -2.46221445 Solving 2.25 + p = -2.46221445 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + p = -2.46221445 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + p = -2.46221445 + -2.25 p = -2.46221445 + -2.25 Combine like terms: -2.46221445 + -2.25 = -4.71221445 p = -4.71221445 Simplifying p = -4.71221445

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.21221445, -4.71221445}

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