P(0)=x^2-2x-13

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Solution for P(0)=x^2-2x-13 equation:


Simplifying
P(0) = x2 + -2x + -13

Reorder the terms for easier multiplication:
0P = x2 + -2x + -13

Anything times zero is zero.
0P = x2 + -2x + -13

Reorder the terms:
0 = -13 + -2x + x2

Solving
0 = -13 + -2x + x2

Solving for variable 'x'.

Combine like terms: 0 + 13 = 13
13 + 2x + -1x2 = -13 + -2x + x2 + 13 + 2x + -1x2

Reorder the terms:
13 + 2x + -1x2 = -13 + 13 + -2x + 2x + x2 + -1x2

Combine like terms: -13 + 13 = 0
13 + 2x + -1x2 = 0 + -2x + 2x + x2 + -1x2
13 + 2x + -1x2 = -2x + 2x + x2 + -1x2

Combine like terms: -2x + 2x = 0
13 + 2x + -1x2 = 0 + x2 + -1x2
13 + 2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
13 + 2x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-13 + -2x + x2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -2x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + -2x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -2x + x2 = 0 + 13
-2x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
-2x + x2 = 13

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 13 + 1

Reorder the terms:
1 + -2x + x2 = 13 + 1

Combine like terms: 13 + 1 = 14
1 + -2x + x2 = 14

Factor a perfect square on the left side:
(x + -1)(x + -1) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(x + -1) equal to 3.741657387 and -3.741657387.

Subproblem 1

x + -1 = 3.741657387 Simplifying x + -1 = 3.741657387 Reorder the terms: -1 + x = 3.741657387 Solving -1 + x = 3.741657387 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 3.741657387 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.741657387 + 1 x = 3.741657387 + 1 Combine like terms: 3.741657387 + 1 = 4.741657387 x = 4.741657387 Simplifying x = 4.741657387

Subproblem 2

x + -1 = -3.741657387 Simplifying x + -1 = -3.741657387 Reorder the terms: -1 + x = -3.741657387 Solving -1 + x = -3.741657387 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -3.741657387 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.741657387 + 1 x = -3.741657387 + 1 Combine like terms: -3.741657387 + 1 = -2.741657387 x = -2.741657387 Simplifying x = -2.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.741657387, -2.741657387}

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