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Akyroo
a fost răspuns

DECI ??

Determinati a ∈ R , daca:
a) A(-1, 2) ∈ G f, unde f : R → R, f (x) = 2x + a ;
b) A(1 ,1) ∈ G f, unde f : R → R, f (x) =ax -2 ;
c) A(a, 2a + 1 ) ∈ Gf,, unde f : R → R, f (x)= 2x + a;
d) A(a, 1) ∈ G f, unde f : R → R, f (x) = x² - 1.

Răspuns :

Sinner123
a) A(-1,2)€Gf f(x)=2x+a => f(-1)=2 iar f(-1)=-2+a
=> 2=-2+a=>a=4
b) f(1)=1 f(1)=a-2 => a-2=1=>a=3
c) f(a)=2a+1 f(a)=3a => 2a+1=3a => a=1
d) f(a)=1 f(a)=a'2-1 =>a'2-1=1 =>a'2=2 =>a=+ sau - rad din2