Question 1086870

I guess, you mean square root

{{{2sqrt( 45)-3sqrt(5)-4sqrt(125)}}}

= {{{2sqrt( 3^2*5)-3sqrt(5)-4sqrt(5*5^2)}}}

= {{{3*2sqrt( 5)-3sqrt(5)-5*4sqrt(5)}}}

= {{{6sqrt( 5)-3sqrt(5)-20sqrt(5)}}}

={{{ 6sqrt( 5)-23sqrt(5)}}}

={{{ -17sqrt(5)}}}

or, as decimal:

={{{ -17*2.23606797749979=38.013}}}...rounded to {{{38}}}