10*p^2+31*p-121=0

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Solution for 10*p^2+31*p-121=0 equation:


Simplifying
10p2 + 31p + -121 = 0

Reorder the terms:
-121 + 31p + 10p2 = 0

Solving
-121 + 31p + 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'.
-12.1 + 3.1p + p2 = 0

Move the constant term to the right:

Add '12.1' to each side of the equation.
-12.1 + 3.1p + 12.1 + p2 = 0 + 12.1

Reorder the terms:
-12.1 + 12.1 + 3.1p + p2 = 0 + 12.1

Combine like terms: -12.1 + 12.1 = 0.0
0.0 + 3.1p + p2 = 0 + 12.1
3.1p + p2 = 0 + 12.1

Combine like terms: 0 + 12.1 = 12.1
3.1p + p2 = 12.1

The p term is 3.1p.  Take half its coefficient (1.55).
Square it (2.4025) and add it to both sides.

Add '2.4025' to each side of the equation.
3.1p + 2.4025 + p2 = 12.1 + 2.4025

Reorder the terms:
2.4025 + 3.1p + p2 = 12.1 + 2.4025

Combine like terms: 12.1 + 2.4025 = 14.5025
2.4025 + 3.1p + p2 = 14.5025

Factor a perfect square on the left side:
(p + 1.55)(p + 1.55) = 14.5025

Calculate the square root of the right side: 3.808214805

Break this problem into two subproblems by setting 
(p + 1.55) equal to 3.808214805 and -3.808214805.

Subproblem 1

p + 1.55 = 3.808214805 Simplifying p + 1.55 = 3.808214805 Reorder the terms: 1.55 + p = 3.808214805 Solving 1.55 + p = 3.808214805 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.55' to each side of the equation. 1.55 + -1.55 + p = 3.808214805 + -1.55 Combine like terms: 1.55 + -1.55 = 0.00 0.00 + p = 3.808214805 + -1.55 p = 3.808214805 + -1.55 Combine like terms: 3.808214805 + -1.55 = 2.258214805 p = 2.258214805 Simplifying p = 2.258214805

Subproblem 2

p + 1.55 = -3.808214805 Simplifying p + 1.55 = -3.808214805 Reorder the terms: 1.55 + p = -3.808214805 Solving 1.55 + p = -3.808214805 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.55' to each side of the equation. 1.55 + -1.55 + p = -3.808214805 + -1.55 Combine like terms: 1.55 + -1.55 = 0.00 0.00 + p = -3.808214805 + -1.55 p = -3.808214805 + -1.55 Combine like terms: -3.808214805 + -1.55 = -5.358214805 p = -5.358214805 Simplifying p = -5.358214805

Solution

The solution to the problem is based on the solutions from the subproblems. p = {2.258214805, -5.358214805}

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