Question

Folosind teorema lui Viete,rezolvati in R ecuatia :
$x^{2} -2x-15=0$

Answer 1

a=1
b=-2
c=-15
S=x₁+x₂=-b/a
S=2/1=2
P=x₁x₂=c/a
P=-15
Δ=4+60=64
x₁=(2-8)/2=-3
x₂=(2+8)/2=5