Difference between establish and confirm

[Tiago]

Business Idiom in English, Intermediate level

ESL/EFL Test #137 "Ways of agreeing", question 8

I'll ......... that in writing to show my acceptance.

(a) confirm
(b) establish
(c) ground
(d) found

Business Idiom in English, Intermediate level

ESL/EFL Test #137 "Ways of agreeing", answer 8

I'll confirm that in writing to show my acceptance.

Correct answer: (a) confirm

Your answer was: incorrect
I'll establish that in writing to show my acceptance.
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What is the difference between establish and confirm in this context?

Tiago

[Alan]

Hi,

Confirm has the sense of making something official as in: The committee confirmed the appointment of the new teacher at the school.

Establish suggests start something for the first time or go back again to the beginning and then begin again as in:

This new teacher wanted the children to behave well in his class and with that in mind he established some ground rules.

A
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