Question

(iii) (r4 – 81) = (x3 + 3x2 + 9x + 27)​

Answer 1

Answer:

The difference of squares identity can be written:

a

2

−

b

2

=

(

a

−

b

)

(

a

+

b

)

We will use this with

a

=

x

and

b

=

3

.