Question

sa se determine coordonatele punctelor de intersectie a graficelor functiilor f,g:R->R f(x)=xpatrat -3x-1,g(x)=x+4

Answer 1

1.G(f) intersecteaza OX
x²-3x-1=0
Delta=(-3)²-4*1*(-1)=9+4=13
x1=(3-√13)/2; A(0;(3-√13)/2) ("/" scrii sub forma de fractie)
x2=(3+√13)/2; B(0;(3+√13)/2)
 G(f) intersecteaza OY
f(0)= -1;C(-1;0)
2. G(f) intersecteaza OX
f(x)=0
x+4=0
x=-4
G(f) intersecteaza OY
f(0)=4