1.

Evaluate 9.9 whole cube

Answer»

Hey!

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(9.9)^3

(9 + 0.9)^3

Using identity -

( a + b )^3 = a^3 + b^3 + 3AB (a + b)

Now, a = 9 , b = 0.9

(9)^3 + (0.9)^3 + 3 × 9 × 0.9 ( 9 + 0.9)

= 729 + 0.729 + 24.3 ( 9.9 )

= 729 + 0.729 + 240.57

= 970.299

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Hope it helps...!!!



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