Question

D
@ Expand (7p-4q) ³using suitable identity​

Answer 1

Answer:

-758pq

Step-by-step explanation:

identity

(a-b)3=a3-3a2b+3ab2-b3

(7p-4q)3=7p3-3×7p2×4q+3×7p×4q2-4q3

=343p-588pq+336pq-849

= -245q-513p

= -758pq

Answer 2

Answer:

343p^3-64q^3-588p^2q+336pq^2

Step-by-step explanation:

using identity, ((a-b)^3 =(a)^3-(b)^3-3ab(a-b)

(7p)^3-(4q)^3-3(7p)(4q)(7p-4q)

343p^3-64q^3-84pq(7p-4q)

343p^3-64q^3-588p^2q+336pq^2