Question

Determinati a ∈ R, stiind ca:

a) f: {-2; 1; 2; 3} → R, f(x) = ax-2 si A(1; -3) ∈ $G_{f}$

b) f: {-2;-1; 1; 2} → R, f(x) = 3x+a si A(1; -1) ∈ $G_{f}$

c) f: {-3; -1; 1; 2} → R, f(x) = ax-5 si A(2; -1) ∈ $G_{f}$



Va rog sa ma ajutati !!

Answer 1

a)

A(1, -3)
f(1)=-3
f(1)=a*1-2=-3
a-2=-3
a=-3+2
a=-1

b)
f(1)=-1
3*1+a=-1
3+a=-1
a=-1-3
a=-4

c)
f(2)=-1
2a-5=-1
2a=-1+5
2a=4
a=2