Question

simplify using suitable identity :(1.5x+3) (1.5x-3)

Answer 1

This equation forms an idetity in algebra

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

then soln is
(1.5)^2x^2-(3)^2=0

the answer should be

2.25x^2=9
x=2

Answer 2

This equation forms an identity of algebra

We can put identy that is ( a + b ) ( a - b )                      

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

By solving the equation, we get

(1.5)^2x^2 - ( 3 )^2 = 0

2.25 x^2 = 9

x = 2                                                                

Therefore, Answer: Simplification of (1.5x + 3 ) ( 1.5x - 3 ) is 2.