Respuesta :

Mibo

Step-by-step explanation:

4a - 7a + 9a

6a

I think this should be the answer

Stephen46

Answer:

The answer is

6√a

Step-by-step explanation:

√16a - √49a + √81a

Simplify the surds

That's

(√16)(√a) - (√49)(√a) + (√81)(√a)

Which is

4√a - 7√a + 9√a

= 4√a + 2√a

= 6√a

Hope this helps you