(k+7)(k-7)=

Solution for (k+7)(k-7)= equation:

Simplifying
(k + 7)(k + -7) = 0

Reorder the terms:
(7 + k)(k + -7) = 0

Reorder the terms:
(7 + k)(-7 + k) = 0

Multiply (7 + k) * (-7 + k)
(7(-7 + k) + k(-7 + k)) = 0
((-7 * 7 + k * 7) + k(-7 + k)) = 0
((-49 + 7k) + k(-7 + k)) = 0
(-49 + 7k + (-7 * k + k * k)) = 0
(-49 + 7k + (-7k + k2)) = 0

Combine like terms: 7k + -7k = 0
(-49 + 0 + k2) = 0
(-49 + k2) = 0

Solving
-49 + k2 = 0

Solving for variable 'k'.

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

Add '49' to each side of the equation.
-49 + 49 + k2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + k2 = 0 + 49
k2 = 0 + 49

Combine like terms: 0 + 49 = 49
k2 = 49

Simplifying
k2 = 49

Take the square root of each side:
k = {-7, 7}