1.

64/125a3-96/25a2+48/5a-8

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Answer:

(64/125)a³ - 8 - (96/25)a² + (48/5)a

= (4/5)³a³ - (2)³ - 6(4/5)²a² + 12(4/5)a

=(4a/5)³ - (2)³ - 6*(4a/5)² + 12(4a/5)

= x³ - (2)³ -6x² + 12x (Putting 4a/5 = x)

= x³ - -6x² + 12x - (2)³

= x³ - (3*x²*2) + (3*x*2²) - (2)³  [(a-b)³ = a³ - 3a²b + 3ab² - b³]

= x³ - 6X(x-2) - (2)³  [(a-b)³ = a³ - 3ab(a-b) - b³]

= (x-2)³

= [(4a/5) - 2]³  (Putting x = 4a/5)

= (2³){(2a/5) - 1}³

=8{(2a - 5)/5}³

= 8/5³ (2a - 5)³

= (8/125) (2a - 5) (2a - 5) (2a - 5)

Answer.

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