Question

Wykonaj działania. a) (1+3ab)(1-ab)= b) (1-√2)(1+√2)= c) (√7+ √3) (√7-√3)=

Answer 1

a) (1+3ab)(1-ab)=1-ab+3ab+3ab²=2ab+3ab²+1

b) (1-√2)(1+√2)=1+√2-√2-2=-1

c) (√7+√3)(√7-√3)=7-√21+√21-3=4