Question

expand the following using suitable identity (3a - 1.5) (3a + 1.5)​

Answer 1

Answer:

9a^2 - 2.25

Step-by-step explanation:

given,

(3a - 1.5) (3a + 1.5)

Using identity, (x - y) ( x + y ) = x^2 - y^2

= (3a)^2 - (1.5)^2

= 9a^2 - 2.25

Answer 2

Answer:

(3a+1.5) (3a-1.5)

= (3a)²-(1.5)²

Step-by-step explanation:

here (a+b)(a-b)= (a)²-(b)² formula is used

now later on u can evaluate it i.e

(3a)²=9a²

(1.5)²= 2.25

= 9a²- 2.25