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How much is 21a^3   -17a^2 less than 89a^3 - 64a^2 + 6a + 16 ?

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How much is 21a3 -17a2 less than 89a3 - 64a2 + 6a + 16 ?

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Required expression is

89a3 -64a2+6a+16-(21a3 -17a2)

= 89a3 -64a2+6a+16 -21a3 + 17a2 On combining the like terms,

= 89a3 -21a3 – 64a2 +17a2 + 6a+16 

= 68a3 -47a2 + 6a+16

So,21a3 -17a2 is 68a3-47a2 + 6a+16 less than 89a3 -64a2+6a+16.

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