Question

evaluate by using suitable identities : (5x+3)(5x-3)​

Answer 1

Answer:

25x²-9

Explanation:

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

Using (a-b)(a+b) =a²-b²

So, (5x+3)(5x-3)

= (5x)²-3²

=25x²-9

Answer 2

Answer:

$given \: (5x + 3)(5x - 3)$

$the \: identity \: is \: (a + b)(a - b) = ( {a}^{2} - {b}^{2} )$

$( {5x}^{2} - {3}^{2} )$

$25 {x}^{2} - 9$