Question 1058454
{{{sqrt(7)/(sqrt(3)+2)}}}
= {{{sqrt(7)*(sqrt(3)-2)/((sqrt(3)-2)*(sqrt(3)+2))}}}
= {{{(sqrt(21) - 2sqrt(7))/(3 - 4)}}}  You had 3+4
= {{{(sqrt(21) - 2sqrt(7))/-1}}}
= {{{2sqrt(7) - sqrt(21)}}}
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The book is also wrong.