c^2-7c-12=0

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Solution for c^2-7c-12=0 equation:


Simplifying
c2 + -7c + -12 = 0

Reorder the terms:
-12 + -7c + c2 = 0

Solving
-12 + -7c + c2 = 0

Solving for variable 'c'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -7c + 12 + c2 = 0 + 12

Reorder the terms:
-12 + 12 + -7c + c2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -7c + c2 = 0 + 12
-7c + c2 = 0 + 12

Combine like terms: 0 + 12 = 12
-7c + c2 = 12

The c term is -7c.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7c + 12.25 + c2 = 12 + 12.25

Reorder the terms:
12.25 + -7c + c2 = 12 + 12.25

Combine like terms: 12 + 12.25 = 24.25
12.25 + -7c + c2 = 24.25

Factor a perfect square on the left side:
(c + -3.5)(c + -3.5) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(c + -3.5) equal to 4.924428901 and -4.924428901.

Subproblem 1

c + -3.5 = 4.924428901 Simplifying c + -3.5 = 4.924428901 Reorder the terms: -3.5 + c = 4.924428901 Solving -3.5 + c = 4.924428901 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + c = 4.924428901 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + c = 4.924428901 + 3.5 c = 4.924428901 + 3.5 Combine like terms: 4.924428901 + 3.5 = 8.424428901 c = 8.424428901 Simplifying c = 8.424428901

Subproblem 2

c + -3.5 = -4.924428901 Simplifying c + -3.5 = -4.924428901 Reorder the terms: -3.5 + c = -4.924428901 Solving -3.5 + c = -4.924428901 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + c = -4.924428901 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + c = -4.924428901 + 3.5 c = -4.924428901 + 3.5 Combine like terms: -4.924428901 + 3.5 = -1.424428901 c = -1.424428901 Simplifying c = -1.424428901

Solution

The solution to the problem is based on the solutions from the subproblems. c = {8.424428901, -1.424428901}

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