√5(√5-√20)= √50-√48+√75= √242-√200+√32=

√5(√5-√20)=√5√5-√5√20=√25-√100=5-10=-5 √50-√48+√75=√2*25-√16*3+√25*3=5√2-4√3+5√3=5√2+√3 √242-√200+√32=√2*121-√2*100+√16*2=11√2-10√2+4√2=5√2