Question 467701
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
{{{sqrt(90)  - sqrt(10) = sqrt(9*10)-sqrt(10) = 3sqrt(10)-sqrt(10) = 2sqrt(10)}}}

sqrt(75*a^3 + a*sqrt(12*a) = sqrt(25*3*a^2*a^1 ) + a*sqrt(4*3*a) = 
                              5a*sqrt(3a)+2a*sqrt(3a) = 7a*sqrt(3a)

 {{{sqrt(5)/sqrt(7)= sqrt(35)/7 }}}