Question

Fie functia f : R --> R
f(x+2)= 2x+3
a) calculati f(3)
b) determinati f(x)

Answer 1

f : |R --> |R
f(x) = 2x+3

a) f(3) = 2•3+3 = 6+3 = 9.


b) Gf n Ox = A(x;0) --> f(x) = 0
2x+3 = 0
2x = -3
x = -3/2 --> A(-3/2;0)

Gf n Oy = B(0;y) --> f(0) = y
2•0+3 = y --> y = 3 --> B (0;3).




J'espère aidé :)