Simplify by Using Formula : (5x - 9) (5x + 9)

Simplify by using formula :
(5x - 9) (5x + 9)

बेरीज

(5x - 9) (5x + 9)
= (5x)²- (9)²
= 25x² - 81
(Using identity : (a + b) (a - b) = a² - b²).

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पाठ 4: Expansions - Exercise 4.1

पाठ 4 Expansions
Exercise 4.1 | Q 4.1

Evaluate the following using suitable identity:

(998)³

Evaluate the following using identities:

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

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

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

If a + b + c = 9 and ab + bc + ca = 23, find the value of a² + b² + c².

Evaluate of the following:

(598)³

Evaluate of the following:

104³ + 96³

Use the direct method to evaluate the following products :
(8 – b) (3 + b)

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

Evaluate: `(4/7"a"+3/4"b")(4/7"a"-3/4"b")`