Question

find all real solutions, leave the answer as a simplifies square root!!!
a^2-405=0

Answer 1

Add both sides by 405 then take square root.

Answer 2

Don't forgot \(\pm\)

Answer 3

I gott hat far and my answer was \[a=+-\sqrt{405}\] an that be sinplified?

Answer 4

No, you can simplify \[\sqrt{405}\]

Answer 5

thats where i get stuck.

Answer 6

9\[\sqrt{5}\]

Answer 7

\[9\sqrt{5}\]

Answer 8

HINT: 405 = 9·45

Answer 9

= 9·9·5

Answer 10

So √405 = √(9²5) = 9√5

Answer 11

OH ok \[\sqrt{81}\times \sqrt{5}=9\sqrt{5}???\]

Answer 12

Yeah

Answer 13

Yes :)

Answer 14

sweet thanks

Answer 15

You're welcome.