Question 118171
1.

{{{sqrt(18x)* sqrt( 2x^3)}}} ...........……….the properties that you need is {{{sqrt(a)*sqrt(b) = sqrt(ab)}}}


={{{sqrt( 18x*2x^3)}}} 


={{{sqrt( 18*2*x*x^3)}}} 


={{{sqrt( 36x^4)}}} 


={{{sqrt( 6^2(x^2)^2)}}} 


={{{6x^2}}} 

2.

{{{sqrt(5)(3 sqrt(5 -4))}}}

{{{3sqrt(5)sqrt(1))}}}

{{{3sqrt(5)}}}


or, if you mean this:

{{{sqrt(5)(3 (sqrt(5)) - 4)}}}

{{{sqrt(5)(3 (sqrt(5)) - 4)}}}

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


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

{{{15 - 12(sqrt(5))}}}