Question

expand using identities. (3x+5)(3x-5)​

Answer 1

( a+b ) ( a-b ) = a²-b²

( 3x) ² - 5²

9x² - 25 = 0

9x² = 25

x² = 25/9

x = √25/9

x = 5 / 3

x = 1.66