Question

5x^2-18x-8 меньше или равно 0
Y=5x^2-18x-8

Answer 1

5x^2-18x-8<=0

D=324+4*5*8=324+160=468

x1=(18+V468)/10=(18+6V13)/10=(9+3V13)/5

x2=(9-3V13)/5

x€[(9-3V13)/5; (9+3V13)/5]