Question

the expression by which (3a--4)is to be multiplied to get a difference of two cubes is

please help me to solve this​

Answer 1

Answer:

(9a²+12a-16)

Step-by-step explanation:

We know,

(a³-b³) = (a-b) (a²+ab-b²)

considering RHS

(a-b) =(3a-4)

hence, a=3a & b=4

therefore, (a²+ab-b²)= (9a²+12a-16)

thus, (3a-4) is to be multiplied by (9a²+12a-16) to express it as a difference of two cubes, namely (27a³-64).