Question

aflati zeroul functiei:
a)f(x)=3x-1
b)f(x)=2-6x
c)f(x)= -$\sqrt{19} x$
d)f(x)=$\sqrt{5x}$-2$\sqrt{5}$

Answer 1

a)f(x)=0 3x-1=0
3x=1
x=1/3
b)2-6x=0
2=6x
x=2/6
x=1/3
c)-√19x=0
x=0
d)√5x=2√5
x=2√5/√5
x=2
daca x e sub radical,ridicând la patrat ambii membri
5x=20
x=4