(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Evaluate, using (a + b)(a - b)= a² - b².
999 x 1001

Evaluate, using (a + b)(a - b)= a² - b².
4.9 x 5.1

Evaluate, using (a + b)(a - b)= a² - b².
15.9 x 16.1

If a - b = 10 and ab = 11; find a + b.

If x + y = 9, xy = 20
find: x - y

If x + y = 9, xy = 20
find: x² - y².

If `"a"  + 1/"a" = 6;`find `"a"  - 1/"a"`

If `"a"  + 1/"a" = 6;`find `"a"^2 - 1/"a"^2`

If `"a"  - 1/"a" = 10;` find `"a"  + 1/"a"`

If `"a"  - 1/"a" = 10`; find `"a"^2 - 1/"a"^2`

If `x + (1)/x = 3`; find `x^2 + (1)/x^2`

If `x + (1)/x = 3`; find `x^4 + (1)/x^4`

If p + q = 8 and p - q = 4, find:
pq

If p + q = 8 and p - q = 4, find:
p² + q²

If m - n = 0.9 and mn = 0.36, find:
m + n

If m - n = 0.9 and mn = 0.36, find:
m² - n².

If x + y = 1 and xy = -12; find:
x - y

If x + y = 1 and xy = -12; find:
x² - y².

If `"a"^2 - 7"a" + 1` = 0 and a = ≠ 0, find :

`"a"  + (1)/"a"`

If `"a"^2 - 7"a" + 1` = 0 and a = ≠ 0, find :

`"a"^2 + (1)/"a"^2`