(√17-4)·(√17+4)= (√11+5)²= (√21-√2)²=

Question

(√17-4)·(√17+4)=
(√11+5)²=
(√21-√2)²=

Answer 1

(√17 - 4)(√17 + 4) = (√17)^2 - 4^2 = 17 - 16 = 1

(√11 + 5)^2 = (√11)^2 + 10√11 + 25 = 11 + 10√11 + 25 = 
= 36 + 10√11

(√21 - √2)^2 = (√21)^2 - 2√42 + (√2)^2 = 21 - 2√42 + 2 = 
= 23 - 2√42 

Comments

спасибо тебе огромное