Verified answer

. . √18 . . . . . . . . . . . . .√18 (√8 + 3) . .. . . . .√18 √8 . + 3√18

.------------ . .. = . . . .--------------------- . = . ----------------------

. √8 - 3 . . . . . . . . . . .(√8 - 3) (√8 + 3). . . . . . . . . 8 - 9

. . . . . . . . . . . . . . . . 3√2 ∙ 2√2. .+ . 3 ∙ 3√2 . . . . . . 12 + 9√2

. . . . . . . . . . . =. . . . --------------------------- . . = . . ------------- . . = . . - (12 + 9√2)

. . . . . . . . . . . . . . . . . . . . . . . - 1. . . . . . . . . . . . . . . . ..- 1

Don't forget that minus sign on the bottom !

answer : -12 - 9 sqrt 2

check your work again, i think you make mistake in your work,

note : multiplied by 3 + sqrt 8 is right