NCERT Solutions for Class 9 Maths Chapter 1: Number System

Chapter: 1

Q. If x/y+y/x=-1 where x, y โ‰  0, then the value of x3 โ€“ y3 is ................... .

  • Ans. x3 โ€“ y3 = 0.
Q. If a + b + c = 0, then a3 + b3 + c3 is ................... .
Ans. a3 + b3 + c3 = 3abc.
Q. If the volume of a cuboid is 3x2 โ€“ 12, then find its possible dimensions.
Ans. Given, Volume of cuboid
= 3x2 โ€“ 12
= 3 (x2 โ€“ 4)
= 3(x โ€“ 2) (x + 2)
Possible dimensions are 3, (x โ€“ 2) and (x + 2) units where x >2.

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