Question

РЕШИТЕ НЕРАВЕНСТВО: x^2-13x+42>0

Answer 1

x^2-13x+42>0;
D=169-4×43=169-168=1
x1=6
x2=7.

Answer 2

D=169-168=1
x1=7
x2=6
f(x)>=0 x ∈ (-∞;6) ∪ (7;+∞)