Question 85293

{{{sqrt(63)-2sqrt(28)+5sqrt(7)}}}  lets rewrite this bad boy as follows:

{{{sqrt(7*9)-2sqrt(7*4)+5sqrt(7)}}}  and this equals:

{{{3sqrt(7)-4sqrt(7)+5sqrt(7)}}}  adding it up , we get:

{{{4sqrt(7)}}}---that shud about do it


Hope this helps----ptaylor