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melalui -2,0 .... 0=4a -2b +c
2,0 ..... 0 =4a+2b+c
----------------------------------------)-)
0= -4b b=0
0,8 ....... 8 = 0+0+c .... c=8
0=4a-2b+c .... 0= 4a - 0 +8 .... a = -8/4 =-2
y=-2x2 +8
8 = a(0+2)(0-2)
8 = a(2)(-2)
8 = -4a
-2 = a
y = -2(x+2)(x-2)
y = -2(x^2-2x+2x-4)
y = -2x^2+8
y = 8-2x^2
jawaban C