Question 260213
(6+4{{{sqrt(7)}}})(6-4{{{sqrt(7))

and this was my attempt:

(6+4{{{sqrt(7)}}})(6-4{{{sqrt(7)}}})=6^(2)-{{{sqrt(7)}}}^(2)=36-7=29

(Correct answer is -76)

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You show 3 binomials, I think there should be 2, and you left out the 4.
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{{{ (6+4sqrt(7))*(6-4sqrt(7)) }}}
= {{{6^2 - (4sqrt(7))^2}}}
= 36 - 16*7 = 36 - 112
= -76