x = 1
y = (1)2 - 2(1)
y = -1

(x,y) = (1,-1)

x = 2
y = (2)2 - 2(2)
y = 0

(x,y) = (2,0)

x = 3
y = (3)2 - 2(3)
y = 3

(x,y) = (3,3)

Baca juga: Kunci Jawaban Matematika Kelas 9 SMP Halaman 92 K13, Ayo Kita Tinjau Ulang: Fungsi Kuadrat

Diketahui y = -x2 + 2x (Tabel bawah kiri)

x = -2
y = -(-2)2 + 2(2)
y = 0

(x,y) = (-2,0)

x = -1
y = -(-1)2 + 2(-1)
y = -3

(x,y) = (-1,-3)

x = 0
y = -(0)2 + 2(0)
y = 0

(x,y) = (0,0)

x = 1
y = -(1)2 + 2(1)
y = 1