Answer:
9x ^2 − 25
Explanation:
( a + b ) ( a − b ) = a ^2 − ^b 2
substitute a with 3 x and b with 5:
( 3 x + 5 ) ( 3 x − 5 ) = ( 3 x ) 2 −5^ 2 = 9 x ^2 − 25
( 3 x + 5 )( 3 x − 5 ) = 9 x ^2 − 25
9x² - 25
Step-by-step explanation:
(a - b)(a + b)= a² - b²
a = 3x ; b = 5
(3x - 5 )(3x + 5)= (3x)² - 5²
= 3²x² - 25
= 9x² - 25
