Question

Fie functia f : R⇒R,f(x)=2x-3. Daca punctul A(x;-5)∈ Gf,atunci x=?

Answer 1

$\sf f:\mathbb R \longrightarrow \mathbb R;~f(x)=2x-3 \\ A(x;-5) \in G_f \Longrightarrow f(x)=-5 \\ Egalam: \\ 2x-3=-5 \\ 2x=-5+3 \\ 2x=-2 \\ \boxed{\rm x=-1}$

Answer 2

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