2=5p^2-7p

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Solution for 2=5p^2-7p equation:


Simplifying
2 = 5p2 + -7p

Reorder the terms:
2 = -7p + 5p2

Solving
2 = -7p + 5p2

Solving for variable 'p'.

Reorder the terms:
2 + 7p + -5p2 = -7p + 7p + 5p2 + -5p2

Combine like terms: -7p + 7p = 0
2 + 7p + -5p2 = 0 + 5p2 + -5p2
2 + 7p + -5p2 = 5p2 + -5p2

Combine like terms: 5p2 + -5p2 = 0
2 + 7p + -5p2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.4 + -1.4p + p2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -1.4p + 0.4 + p2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -1.4p + p2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -1.4p + p2 = 0 + 0.4
-1.4p + p2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-1.4p + p2 = 0.4

The p term is -1.4p.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4p + 0.49 + p2 = 0.4 + 0.49

Reorder the terms:
0.49 + -1.4p + p2 = 0.4 + 0.49

Combine like terms: 0.4 + 0.49 = 0.89
0.49 + -1.4p + p2 = 0.89

Factor a perfect square on the left side:
(p + -0.7)(p + -0.7) = 0.89

Calculate the square root of the right side: 0.943398113

Break this problem into two subproblems by setting 
(p + -0.7) equal to 0.943398113 and -0.943398113.

Subproblem 1

p + -0.7 = 0.943398113 Simplifying p + -0.7 = 0.943398113 Reorder the terms: -0.7 + p = 0.943398113 Solving -0.7 + p = 0.943398113 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + p = 0.943398113 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + p = 0.943398113 + 0.7 p = 0.943398113 + 0.7 Combine like terms: 0.943398113 + 0.7 = 1.643398113 p = 1.643398113 Simplifying p = 1.643398113

Subproblem 2

p + -0.7 = -0.943398113 Simplifying p + -0.7 = -0.943398113 Reorder the terms: -0.7 + p = -0.943398113 Solving -0.7 + p = -0.943398113 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + p = -0.943398113 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + p = -0.943398113 + 0.7 p = -0.943398113 + 0.7 Combine like terms: -0.943398113 + 0.7 = -0.243398113 p = -0.243398113 Simplifying p = -0.243398113

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.643398113, -0.243398113}

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