matematika plisss bantu jawab no 14, 15 pakai caraaa yaaaa

15).
a=-1, b=-2, c=3.

t.ekstrim  >>
x=-b/2a=-(-2)/2(-1)=2/-2= -1
y=D/(-4a)= (b²-4ac)/(-4a)=((-2)²-4(-1)(3))/(-4(-1))=(4+12)/4=4

jadi, P(-1,4)