我想問一條數呀

16a^2-9
=4^2a^2-3^2
=(4a)^2-3^2
=(4a-3)(4a+3)

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

16a2次方-9
=(4a)^2-3^2
=(4a+3)(4a-3)

faterization??
if yes, then

16a^2-9
=(4a)^2-(3)^2
=(4a+3)(4a-3)

16a2次方-9
= (4a)2次方 - 3嘅2次方 --- 恒等式
= ( 4a + 3 )( 4a - 3 )