Question

(x+2)(x-7) больше 0
Решите неравенство​

Answer 1

(х+2)×(х-7) > 0

x²-7x+2x-14>0

x²-5x-14>0

D=25-4*(-14)=25+4*14=81

x1 = (5+9)/2 = 7

x2 = (5-9)/2 = -2

x > 0 при  х є (-∞:-2)U(7;+∞)