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

Solution:

We have to determine how much is 21a³ - 17a² less than 89a³ - 64a² + 6a + 16.

Required expression = 89a³ - 64a² + 6a + 16 - (21a³ - 17a²)

By combining like terms,

= 89a³ - 64a² + 6a + 16 - 21a³ + 17a²

= 89a³ - 21a³ - 64a² + 17a² + 6a + 16

= (89 - 21)a³ + (-64 + 17)a² + 6a + 16

= (68)a³ + (-47)a² + 6a + 16

= 68a³ - 47a² + 6a + 16

Therefore, the required expression is 68a³ - 47a² + 6a + 16.

✦ Try This: How much is 42a³ - 22a² less than 98a³ - 71a² + 9a + 26

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 12

NCERT Exemplar Class 7 Maths Chapter 10 Problem 61

Summary:

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

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