D
@ Expand (7p-4q) ³using suitable identity
Answers
Answered by
5
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
Answered by
0
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
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