c^2-2c-10=0

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Solution for c^2-2c-10=0 equation:


Simplifying
c2 + -2c + -10 = 0

Reorder the terms:
-10 + -2c + c2 = 0

Solving
-10 + -2c + c2 = 0

Solving for variable 'c'.

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -2c + 10 + c2 = 0 + 10

Reorder the terms:
-10 + 10 + -2c + c2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -2c + c2 = 0 + 10
-2c + c2 = 0 + 10

Combine like terms: 0 + 10 = 10
-2c + c2 = 10

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

Add '1' to each side of the equation.
-2c + 1 + c2 = 10 + 1

Reorder the terms:
1 + -2c + c2 = 10 + 1

Combine like terms: 10 + 1 = 11
1 + -2c + c2 = 11

Factor a perfect square on the left side:
(c + -1)(c + -1) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(c + -1) equal to 3.31662479 and -3.31662479.

Subproblem 1

c + -1 = 3.31662479 Simplifying c + -1 = 3.31662479 Reorder the terms: -1 + c = 3.31662479 Solving -1 + c = 3.31662479 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + c = 3.31662479 + 1 Combine like terms: -1 + 1 = 0 0 + c = 3.31662479 + 1 c = 3.31662479 + 1 Combine like terms: 3.31662479 + 1 = 4.31662479 c = 4.31662479 Simplifying c = 4.31662479

Subproblem 2

c + -1 = -3.31662479 Simplifying c + -1 = -3.31662479 Reorder the terms: -1 + c = -3.31662479 Solving -1 + c = -3.31662479 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + c = -3.31662479 + 1 Combine like terms: -1 + 1 = 0 0 + c = -3.31662479 + 1 c = -3.31662479 + 1 Combine like terms: -3.31662479 + 1 = -2.31662479 c = -2.31662479 Simplifying c = -2.31662479

Solution

The solution to the problem is based on the solutions from the subproblems. c = {4.31662479, -2.31662479}

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