Respuestas
6) Show that :
a) ( 3³ - 1 )/2 = 3² + 3 + 1
( 27 - 1)/2 = 9 + 3 + 1
26/2 = 13
13 = 13
b) (4³ -1 )/3 = 4²+ 4 + 1
( 64- 1)/3 = 16 + 4 + 1
63/3 = 21
21 = 21
c) Write a similar expression involving 5³ :
(5³ -1 )/4 = 5²+ 5 +1
( 125 - 1)/4 = 25 +5+1
124/4 = 31
31 = 31
7) a) √4096 = √64² = 64
b) ∛4096 = ∛16³= 16
11) Explain why Alicia is correct :
A square root of 25 could be less than a square root of 16
√25 couldn't be less than √16 , because :
√25 = 5 √16 = 4
√25 > √16