Eight tenths of x under the root sign 1. and the root sign 4X are not a kind of quadratic roots.
Solution: 8/x =√[√8 x√/√x x√=√2/x√2x, \
Root 4X =√2? X=2√X
Ab of c under the root sign? C (a > 0, b > 0) of a fraction under the sum root sign is a quadratic root of the same kind.
Ab of c under the root sign? =√ab？ C = (b/c) √ AC letter of credit
C = √ c a/a a a = ﹙1√ a ac (a > 0, B > 0) under the radical sign.
3. T (s > 0) of 2s under radical sign and 3s under radical sign is not the same kind of quadratic radical.
Under the root sign, 2s = √ 2st/t t =-1/t √ 2st.
Under the radical sign, 3s is t = √ t3s/3s3s = ﹙1/3s √ 3st (s > 0).
4. m+n of M-N under one-third radical sign and M-N under two radical signs (m > n > 0) are similar quadratic radicals.
m+n =﹙ 1/3﹚√m+n﹚m-n﹚/﹙n ﹚.-n？ ﹚
m-n =√√m+n√m-n√/√m+n√√m+n√=√m+n√。 -n？ ﹚