(c-1)(c+2)=14

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Solution for (c-1)(c+2)=14 equation:


Simplifying
(c + -1)(c + 2) = 14

Reorder the terms:
(-1 + c)(c + 2) = 14

Reorder the terms:
(-1 + c)(2 + c) = 14

Multiply (-1 + c) * (2 + c)
(-1(2 + c) + c(2 + c)) = 14
((2 * -1 + c * -1) + c(2 + c)) = 14
((-2 + -1c) + c(2 + c)) = 14
(-2 + -1c + (2 * c + c * c)) = 14
(-2 + -1c + (2c + c2)) = 14

Combine like terms: -1c + 2c = 1c
(-2 + 1c + c2) = 14

Solving
-2 + 1c + c2 = 14

Solving for variable 'c'.

Reorder the terms:
-2 + -14 + 1c + c2 = 14 + -14

Combine like terms: -2 + -14 = -16
-16 + 1c + c2 = 14 + -14

Combine like terms: 14 + -14 = 0
-16 + 1c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 1c + 16 + c2 = 0 + 16

Reorder the terms:
-16 + 16 + 1c + c2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 1c + c2 = 0 + 16
1c + c2 = 0 + 16

Combine like terms: 0 + 16 = 16
1c + c2 = 16

The c term is 1c.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
c + 0.25 + c2 = 16 + 0.25

Reorder the terms:
0.25 + c + c2 = 16 + 0.25

Combine like terms: 16 + 0.25 = 16.25
0.25 + c + c2 = 16.25

Factor a perfect square on the left side:
(c + 0.5)(c + 0.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(c + 0.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

c + 0.5 = 4.031128874 Simplifying c + 0.5 = 4.031128874 Reorder the terms: 0.5 + c = 4.031128874 Solving 0.5 + c = 4.031128874 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + c = 4.031128874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + c = 4.031128874 + -0.5 c = 4.031128874 + -0.5 Combine like terms: 4.031128874 + -0.5 = 3.531128874 c = 3.531128874 Simplifying c = 3.531128874

Subproblem 2

c + 0.5 = -4.031128874 Simplifying c + 0.5 = -4.031128874 Reorder the terms: 0.5 + c = -4.031128874 Solving 0.5 + c = -4.031128874 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + c = -4.031128874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + c = -4.031128874 + -0.5 c = -4.031128874 + -0.5 Combine like terms: -4.031128874 + -0.5 = -4.531128874 c = -4.531128874 Simplifying c = -4.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. c = {3.531128874, -4.531128874}

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