Question

Can someone help me? My problem says, Multiply (sqrt10 -9)^2

Answer 1

you gotta work this out: (sqrt10-9)(sqrt10-9)

Answer 2

Ok. Tryin now.

Answer 3

I get sqrt 100-81.

Answer 4

you should get : 10-18sqrt10+81

Answer 5

How?

Answer 6

I know the answer, 91-18 sqrt 10. Don't know how to get it.

Answer 7

use the identity (a-b)^2 to check your answers....
(a-b)^2=a^2+b^2-2ab

for this question simply multiply (sq. root 10-9)(sq. root10-9)
i.e, 10-9sq. root 10-9 sq.root 10+81
=91-18 sq. root 10

Answer 8

How?