Question

If a –b = 4 and ab = 21, find the value of a^3 -b^3

Answer 1

Step-by-step explanation:

a-b=4 and ab=21 so a=7 and b= 3

now, = a^3-b^3

= 7^3 - 3^3

= 343 - 27

= 316

therefore ans is 316.