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