Question 257293
First:{{{sqrt(7)sqrt(7)=7 }}}
Outer:{{{sqrt(7)*(-5)=-5*sqrt(7)}}}

Inner:{{{2*sqrt(7)=2*sqrt(7)}}}

Last: {{{(2)(-5)=-10}}}
Then add it all together,
{{{(sqrt(7)+2)(sqrt(7)-5)=7-5*sqrt(7)+2*sqrt(7)-10}}}
{{{(sqrt(7)+2)(sqrt(7)-5)=-3-3*sqrt(7)}}}
{{{(sqrt(7)+2)(sqrt(7)-5)=-3(1+sqrt(7))}}}