k=(c-1)(c+6)

Solution for k=(c-1)(c+6) equation:

Simplifying
k = (c + -1)(c + 6)

Reorder the terms:
k = (-1 + c)(c + 6)

Reorder the terms:
k = (-1 + c)(6 + c)

Multiply (-1 + c) * (6 + c)
k = (-1(6 + c) + c(6 + c))
k = ((6 * -1 + c * -1) + c(6 + c))
k = ((-6 + -1c) + c(6 + c))
k = (-6 + -1c + (6 * c + c * c))
k = (-6 + -1c + (6c + c2))

Combine like terms: -1c + 6c = 5c
k = (-6 + 5c + c2)

Solving
k = -6 + 5c + c2

Solving for variable 'k'.

Move all terms containing k to the left, all other terms to the right.

Simplifying
k = -6 + 5c + c2