ICSE ICSE Class 8 - CISCE Question Bank Solutions for Mathematics

If `"m"  -1/"m"=5`, find: `"m"^2-1/"m"^2`

If a² + b² = 41 and ab = 4, find : a + b

If `2"a"+1/(2"a")=8`, find : `4"a"^2+1/(4"a"^2)`

If `2"a"+1/(2"a")=8`, find : `16"a"^4+1/(16"a"^4)`

If `3"x"-1/(3"x")=5`, find : `9"x"^2+1/(9"x"^2)`

If `3"x"-1/(3"x")=5`, find : `81"x"^4+1/(81"x"^4)`

Expand : (3x – 4y + 5z)²

Expand : (2a – 5b – 4c)²

Evaluate:

`1 ÷ 1/3`

The product of two rational numbers is -2. If one of them is `4/7`, find the other.

Evaluate:

`3 ÷ 3/5`

Evaluate:

`- 5/12 ÷ 1/16`

The product of two numbers is `(-4)/9`. If one of them is` (-2)/27`, find the other.

Evaluate:

`- 21/16 ÷ ((-7)/8)`

Evaluate:

`0 ÷ (- 4/7)`

Evaluate:

`8/(-5) ÷ 24/25`

m and n are two rational number such that 

`"m"xx"n"=-25/9`

if `"m"=5/3`, find `"n"`.

`

Evaluate:

`-3/4 ÷ (-9)`

m and n are two rational number such that

`"m"xx"n"=-25/9`

if `"n"=-10/9,`find `"m"`

Evaluate:

`3/4 ÷ (-5/12)`