tolong jwb xkuadrat +4x-21<0

X²+4X-21 < 0
A= 1, B= 4, C= -21
m+n= b
m.n= c
m+n= 4
m.n = -21
7+(-3)=4
7.(-3) = -21

( X +7 ) ( X-3 )
X+7=0. X-3=0
X= -7. X= 3
Jadi Hp (-7, 3)

semoga dapat membantu yachh