Question

Combine the following expressions. √16a - √49a + √81a

Answer 1

Explanation:

4a - 7a + 9a

6a

I think this should be the answer

Answer 2

The answer is

6√a

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