Question

factorise : (3x+5) (3x-5)​

Answer 1

Answer:

9x² - 25

Step-by-step explanation:

(3x + 5)(3x - 5)           [(a + b)(a - b) = a² - b²]

==> (3x)² - (5)²

==> 9x² - 25

Answer 2

Question

(3x+5)(3x-5)

Solution

=> (3x+5)(3x-5)

=> (3x)^2-(5)^2

=> (9x)^2-(25)

By using the a^2-b^2 formula or identity .

Extra explanation ;

(a+b)^2 = a^2+b^2+2ab

(a-b)^2 = a^2+b^2-2ab

a^2-b^2 = (a+b)(a-b)