Question

Fie f: R-R f(x)=3x+9
Determinati a∈R a.i. M(a,2a+1)∈Gf

Answer 1

M(a,2a+1)∈Gf ⇒ f(a) = 2a+1

f(a) = 3a+9

3a+9 = 2a+1

3a - 2a = 1-9

a = - 8

M(-8; -15) ∈ Gf

Answer 2

Răspuns

f(a) =2a+1

Explicație pas cu pas:

f(a) =2a+1

3a+9=2a+1

a+8=0

a=-8

verificare f(8)=3*(-8)+9=-24+9=-15

2*(-8) +1=-16+1=-15 deci bine rezolvat