Question

Identify a and b (as used in the above sum and difference of cubes expressions) in each of the following (do not factorise).

a) 8y^3 + z^3
b) 1 − 64h^3
c) 1/8(c^3) - e^3g^3
d) t^3 - u^3/216

Show all working out thanks.

Answer 1

a = 2y, b = z
a = 1, b = 4h
a = 1/(2c), b = eg
a = t, b = u/6

Answer 2

(2y)^3 + (z)^3 = 8y^3 + z^3
(1)^3 - (4h)^3 = 1 - 64h^3
....