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Verified answer
Maaf kalu salah :), good luck :)Dengan :
a = -2
b = 1
c = 15
Xp = -b/2a
Xp = -1/2(-2)
Xp = -1/-4
Xp = 1/4 atau 0,25
Yp = -(b^2-4ac)/4a
Yp = -((1)^2-4(-2)(15))/4(-2)
Yp = -(1+120)/-8
Yp = 121/8
Yp = 15 1/8 atau 15,125
Sumbu simetri : {0,25 ; 15,125}
Maaf jika ada kesalahan :)