Question

2 square root of 45 end root minus 2 square root 5

Answer 1

try mathway.com it's a calculator that will do any of these kind of problems. :)

Answer 2

well look at it like this

you need to express 45 as the product of 2 factors, 1 of the factors being a square number.

then use some of the laws for radicals.

\[2\sqrt{45} = 2 \sqrt{9 \times 5} = 2\sqrt{9} \times 2 \sqrt{5} = 6\sqrt{5}\]

so the problem is now

\[6\sqrt{5} - 2 \sqrt{5} = \]