Question

cine poate sa ma ajute la acest test?

Answer 1

E(X) = (x-5) (x+5)/ x(x+5) + 15 / x(x-5) : 2/(x-5)
E(X) = x-5 / x + 10/ x(x-5) * (x-5)/2
E(X) = x-5/x + 10/2x
E(X) = x-5/ x + 5/x
E(X) = x-5+5 / x
E(X) = x/x
E(X) =1

f(0) = 0
f(0) = m² +2m
m²+2m = 0
m(m+2) = 0
m=0 sau m+2= 0 ⇒ m=-2 ⇒ m∈{0,-2}