hm? do no longer possibly comprehend the question. Is that precisely the way it extremely is interior the e book? 2 does not have a suited sq. root. Neither does 3 or 5. 4 has a suited sq. root this is easy to unravel. 4= t*t the place t thus can equivalent 2 or -2. in case you attempt to do an analogous ingredient with 3 3=t*t you don't get a real answer for t, you in elementary terms might desire to approximate. yet another words use a calculator. t thus is approximately a million.73205 employing a calculator and/or approximately -a million.73205 employing a calculator

Do "FOIL"

(5 + 2√3)(√3 - 3 )

= 5√3 - 15 + 2√9 - 6√3

= 5√3 - 6√3 - 15 + 2•3

= -1√3 - 15 + 6

= -9 - √3

(5+2√3)(√3-3)=

=5⋅√3+2⋅〖√3〗⋅〖√3〗-3⋅5-3⋅2⋅√3=

=5⋅√3+2⋅3-15-6⋅√3=-√3-9