Question

If 7a - 5b = 6 and ab = 9, then find the value of 343a3-125b3​

Answer 1

Answer:

7a-5b=6

ab=9

both side cube

(7a-5b)³=6³

(7a)³+(5b)³-3×7a×5b=216

343a³ + 125b³-105ab=216

343a³+125b³-105×9=216 (given ab=9)

343a³+125b³-945=216

343a³+125b³=216+945

343a³+125b³=1161

hope its helps you.