Answer:the factors are r= -2 or r= -2.6
Step-by-step explanation:
5r^2+23r+26=0
The equation cannot factorized
So the general formula would be used
r = [-b +-√(b^2 -4ac)]/2a
a = 5
b =23
c = 26
r =[ -23+-√(23^2-4×5×26)]/2×5
= [-23+-√529-520)]/10
=(-23+-√9)/10
=(-23+-3)/10
r = (-23+3)/10 or r= (-23-3)/10
r= -20/10 or r= -26/10
r= -2 or r= -2.6
