Question

Math help please.I don't understand how to solve this problem.

Answer 1

`(144)/(2025)`

Explanation:

( 3 a b ) ² = 9 a² b²

Given that,

a = -
`(1)/(5)`

b = -
`(4)/(9)`

Now you have to replace a and b with -
`(1)/(5)` and -
`(4)/(9)` respectively.

Let us solve now.

9 a² b² = 9 × ( -
`(1)/(5)` ) ² × ( -
`(4)/(9)` ) ²

= 9 ×
`(1)/(25)` ×
`(16)/(81)`

=
`(9*1*16)/(25*81)`

=
`(144)/(2025)`

Let me know if you've any other questions. :-)