English Medium Class 9 - CBSE Question Bank Solutions

Evaluate the following using identities:

`(a^2b - b^2a)^2`

Evaluate following using identities:

(a - 0.1) (a + 0.1)

Evaluate the following using identities:

(1.5x² − 0.3y²) (1.5x² + 0.3y²)

Evaluate the following using identities:

(399)²

Evaluate following using identities:

991 ☓ 1009

Evaluate the following using identities:

117 x 83

Evaluate the following using identities:

(0.98)²

Simplify the following: 175 x 175 x 2 x 175 x 25 x 25 x 25

Simplify the following:

322 x 322 - 2 x 322 x 22 + 22 x 22

Simplify the following:

0.76 x 0.76 - 2 x 0.76 x 0.24 x 0.24 + 0.24

Simplify the following

`(7.83 + 7.83 - 1.17 xx 1.17)/6.66`

if `x + 1/x = 11`, find the value of `x^2 + 1/x^2`

If `x + 1/x = sqrt5`, find the value of `x^2 + 1/x^2` and `x^4 + 1/x^4`

If `x^2 + 1/x^2 = 66`, find the value of `x - 1/x`

if `x^2 + 1/x^2 = 79` Find the value of `x + 1/x`

If 9x² + 25y² = 181 and xy = −6, find the value of 3x + 5y

If 2x + 3y = 8 and xy = 2 find the value of `4x^2 + 9y^2`

If 3x - 7y = 10 and xy = -1, find the value of `9x^2 + 49y^2`

Simplify the following products:

`(1/2a - 3b)(1/2a + 3b)(1/4a^2 + 9b^2)`

Simplify the following products:

`(m + n/7)^3 (m - n/7)`