algebra
posted by Gabby on .
(sqr root of 2 + 3*sqr root of 5)(sqr root of 23*sqr root of 5)

(√2 + 3√5)(√2  3√5)
this has the pattern for the difference of squares
(a + b)(a  b) = a^2  b^2
so your question has an answer of
(√2)^2  (3√5)^2
= 2  45
= 43