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rumus = F(x) = a(X-Xp)² + Yp
subst:
Y= a(X-1)² + 3
subst.titik lain:
5= a(2-1)² + 3
5= a.1 + 3
3-5 = a
-2 = a
Y= a(X-1)² + 3
= -2 (x²-x+1) + 3
= -2x²+2x-2+3
= -2x²+2x+1