Question

5) a) (2√3-3√2)*(√3+2√2)=?
b) (√5-3√2)*(2√5+√2)=?
c) (2√7-√3*(√7+2√3)=?
d) (4√3-2√5)*(√3+3√5)=?

Ajutor...

Answer 1

a)(2√3-3√2)(√3+2√2)=
2√9+4√6-3√6-6√4=6+4√6-3√6-12=-6+√6
b)(√5-3√2)×(2√5+√2)=
2√25+√10-6√10-3√4=
10+√10-6√10-6=
4-5√10
c)(2√7-√3)×(√7+2√3)=
2√49+4√21-√21-2√9=
14+4√21-√216=
8+3√21
d)(4√3-2√5)×(√3+3√5)=
4√9+12√5-2√15+6√25=
12+10√15-30=
-18+10√15
succes