Question

(2+√15)(√5-√3)= помогите

Answer 1

(2+√15)(√5-√3)=2√5+√(15*5)-2√3-√(15*3)=
=2√5+√(3*25)-2√3-√(5*9)=2√5+√3*√25-2√3-√5*√9=
=2√5+5√3-2√3-3√5=3√3-√5.