7p^2+3p-7=0

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Solution for 7p^2+3p-7=0 equation:


Simplifying
7p2 + 3p + -7 = 0

Reorder the terms:
-7 + 3p + 7p2 = 0

Solving
-7 + 3p + 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'.
-1 + 0.4285714286p + p2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 0.4285714286p + 1 + p2 = 0 + 1

Reorder the terms:
-1 + 1 + 0.4285714286p + p2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.4285714286p + p2 = 0 + 1
0.4285714286p + p2 = 0 + 1

Combine like terms: 0 + 1 = 1
0.4285714286p + p2 = 1

The p term is 0.4285714286p.  Take half its coefficient (0.2142857143).
Square it (0.04591836735) and add it to both sides.

Add '0.04591836735' to each side of the equation.
0.4285714286p + 0.04591836735 + p2 = 1 + 0.04591836735

Reorder the terms:
0.04591836735 + 0.4285714286p + p2 = 1 + 0.04591836735

Combine like terms: 1 + 0.04591836735 = 1.04591836735
0.04591836735 + 0.4285714286p + p2 = 1.04591836735

Factor a perfect square on the left side:
(p + 0.2142857143)(p + 0.2142857143) = 1.04591836735

Calculate the square root of the right side: 1.022701505

Break this problem into two subproblems by setting 
(p + 0.2142857143) equal to 1.022701505 and -1.022701505.

Subproblem 1

p + 0.2142857143 = 1.022701505 Simplifying p + 0.2142857143 = 1.022701505 Reorder the terms: 0.2142857143 + p = 1.022701505 Solving 0.2142857143 + p = 1.022701505 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + p = 1.022701505 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + p = 1.022701505 + -0.2142857143 p = 1.022701505 + -0.2142857143 Combine like terms: 1.022701505 + -0.2142857143 = 0.8084157907 p = 0.8084157907 Simplifying p = 0.8084157907

Subproblem 2

p + 0.2142857143 = -1.022701505 Simplifying p + 0.2142857143 = -1.022701505 Reorder the terms: 0.2142857143 + p = -1.022701505 Solving 0.2142857143 + p = -1.022701505 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + p = -1.022701505 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + p = -1.022701505 + -0.2142857143 p = -1.022701505 + -0.2142857143 Combine like terms: -1.022701505 + -0.2142857143 = -1.2369872193 p = -1.2369872193 Simplifying p = -1.2369872193

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.8084157907, -1.2369872193}

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