Could someone kindly help me in finding a solution?

see explanation

Step-by-step explanation:

(a)

= =

Substitute x = - 1 into the expression

(- 1 ) = = = = -

(b)

The denominator of cannot be zero as this would make undefined

To find the values that x cannot be , equate the denominator to zero and solve for x

(x - 2)(x + 2) = 0

x - 2 = 0 ⇒ x = 2

x + 2 = 0 ⇒ x = - 2

values that are not in the domain of : x = - 2, x = 2

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.