Question

А) u2 - 9; б) 4 – а2b2; в) 1/16a2-b4

Answer 1

a)u²-9=(u-3)(u+3)

б)4 -а²b²=(2-ab)(2+ab)

в) 1/16a²-b⁴=(1/4a-b²)(1/4a+b²) или (0.25a-b²)(0.25a+b²)

Answer 2

It looks like you've provided three mathematical expressions, but you haven't specified what you want to do with them. Please provide more context or details about what you'd like to know or do with the expressions u2 - 9, 4 - а2b2, and 1/16a2-b4, so I can assist you accordingly. Are you looking to simplify, factor, solve, or perform any other operations on these expressions?