no 1 tolong dong bantuan nya gan

A=-2
B=6
C=1

P(-1/2(A),-1/2(B))
P(-1/2(-2),-1/2(6))
P(1,-3)

R=akar(1/4(A)^2+1/4(B)^2-C)
=akar(1/4(4)+1/4(36)-1)
=akar(1+9-1)
=akar9
=3
Semoga membantu