Question

If a − b = −8 and ab = −12, then a³ − b³ =

(a) −244

(b) −240

(c) −224

(d) −260

Answer 1

To find the value of a³ − b³

Given

Using identity

Here we get

Transposing -288 to left hand side we get

Hence the value of is -224

The correct choice is .