Evaluate: (2

Evaluate: `(2"x"-3/5)(2"x"+3/5)`

Sum

`(2"x"-3/5)(2"x"+3/5)`

`=(2"x")^2-(3/5)^2` .......[ ∵ (a − b) (a + b) = a²b²]

`=4"x"^2-9/25`

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Chapter 12: Identities - Exercise 12 (D) [Page 155]

Chapter 12 Identities
Exercise 12 (D) | Q 2.01 | Page 155

Factorise the following using appropriate identity:

9x² + 6xy + y²

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

Evaluate of the following:

111³ − 89³

Evaluate of the following:

93³ − 107³

Use the direct method to evaluate the following products :
(5a + 16) (3a – 7)

Simplify by using formula :
(a + b - c) (a - b + c)

Simplify by using formula :

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

Simplify:
(2x - 4y + 7)(2x + 4y + 7)

Expand the following:

(3a – 5b – c)²

Evaluate: (2"X"-3/5)(2"X"+3/5) - Mathematics