Question

Combine:
square root 90 - square root 10

Answer 1

\[\sqrt{90}-\sqrt{10}\]

Answer 2

\[=\sqrt{80}\]

Answer 3

oh heck no

Answer 4

not true that \(\sqrt{25}-\sqrt{9}=\sqrt{16}\) is it? that would be like saying \(5-3=4\)

Answer 5

first rewrite \(\sqrt{90}=\sqrt{9\times 10}=\sqrt{9}\sqrt{10}=3\sqrt{10}\) then you have
\[3\sqrt{10}-\sqrt{10}\] and combine like terms

Answer 6

I would combine the 10's

Answer 7

did I do it right

Answer 8

not quite
you cannot add or subtract radicals that way
\[3x-x=2x\] and so
\[3\sqrt{10}-\sqrt{10}=2\sqrt{10}\]