7p^2+10p-20=0

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Solution for 7p^2+10p-20=0 equation:


Simplifying
7p2 + 10p + -20 = 0

Reorder the terms:
-20 + 10p + 7p2 = 0

Solving
-20 + 10p + 7p2 = 0

Solving for variable 'p'.

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

Divide each side by '7'.
-2.857142857 + 1.428571429p + p2 = 0

Move the constant term to the right:

Add '2.857142857' to each side of the equation.
-2.857142857 + 1.428571429p + 2.857142857 + p2 = 0 + 2.857142857

Reorder the terms:
-2.857142857 + 2.857142857 + 1.428571429p + p2 = 0 + 2.857142857

Combine like terms: -2.857142857 + 2.857142857 = 0.000000000
0.000000000 + 1.428571429p + p2 = 0 + 2.857142857
1.428571429p + p2 = 0 + 2.857142857

Combine like terms: 0 + 2.857142857 = 2.857142857
1.428571429p + p2 = 2.857142857

The p term is 1.428571429p.  Take half its coefficient (0.7142857145).
Square it (0.5102040819) and add it to both sides.

Add '0.5102040819' to each side of the equation.
1.428571429p + 0.5102040819 + p2 = 2.857142857 + 0.5102040819

Reorder the terms:
0.5102040819 + 1.428571429p + p2 = 2.857142857 + 0.5102040819

Combine like terms: 2.857142857 + 0.5102040819 = 3.3673469389
0.5102040819 + 1.428571429p + p2 = 3.3673469389

Factor a perfect square on the left side:
(p + 0.7142857145)(p + 0.7142857145) = 3.3673469389

Calculate the square root of the right side: 1.835033226

Break this problem into two subproblems by setting 
(p + 0.7142857145) equal to 1.835033226 and -1.835033226.

Subproblem 1

p + 0.7142857145 = 1.835033226 Simplifying p + 0.7142857145 = 1.835033226 Reorder the terms: 0.7142857145 + p = 1.835033226 Solving 0.7142857145 + p = 1.835033226 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.7142857145' to each side of the equation. 0.7142857145 + -0.7142857145 + p = 1.835033226 + -0.7142857145 Combine like terms: 0.7142857145 + -0.7142857145 = 0.0000000000 0.0000000000 + p = 1.835033226 + -0.7142857145 p = 1.835033226 + -0.7142857145 Combine like terms: 1.835033226 + -0.7142857145 = 1.1207475115 p = 1.1207475115 Simplifying p = 1.1207475115

Subproblem 2

p + 0.7142857145 = -1.835033226 Simplifying p + 0.7142857145 = -1.835033226 Reorder the terms: 0.7142857145 + p = -1.835033226 Solving 0.7142857145 + p = -1.835033226 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.7142857145' to each side of the equation. 0.7142857145 + -0.7142857145 + p = -1.835033226 + -0.7142857145 Combine like terms: 0.7142857145 + -0.7142857145 = 0.0000000000 0.0000000000 + p = -1.835033226 + -0.7142857145 p = -1.835033226 + -0.7142857145 Combine like terms: -1.835033226 + -0.7142857145 = -2.5493189405 p = -2.5493189405 Simplifying p = -2.5493189405

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.1207475115, -2.5493189405}

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