Question

1.calcule

a) 2^{3} = b) (-5)^{3} c) 7^{1} d) (2/5)^{2}

Answer 1

a)
2³ = 2.2.2 = 8

b)
(-5)³ = (-5).(-5).(-5) =  - 125

c)
7¹ = 7

d)

[  2]²  =    2²         4
-----       ------   = -----
[  5]         5²         25