Math, asked by shaiu76, 10 months ago

if (5x-4y)=7 and xy=8 find 125x^3-64y^3

Answers

Answered by pal69

10

Answer:

(5x-4y) =7

(5x-4y) ³=7³

125x³-64y³-3*5x*4y*(5x-4y) =343

125x³-64y³-60*8*7=343

125x³-64y³=3703.

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