Math, asked by jaypatel141, 6 months ago

If 2a+3b=7 and ab =2, find 8a cube + 27b cube (give with full formula)​

Answers

Answered by tanishqbansal2712
1

Answer:

as we know,

(x + y)³ = x³ + y³ + 3x²y + 3xy²

= x³ + y³ + 3xy(x + y)

(2a + 3b)³ = (2a)³ + (3b)³ + 3(2a)(3b)[2a + 3b]

(7)³ = 8a³ + 27b³ + 12ab(7)

343 = 8a³ + 27b³ + 12(2)(7)

343 = 8a³ +27b³ + 168

343 - 168 = 8a³ + 27b³

175 = 8a³ + 27b³

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