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melalui puncak (-4,3) --> xs= -4, yp = 3
y = a (x+4)²+3
melalui (-2,11) --> x=-2, y = 11
11 = a (-2+4)²+3
= a (4) + 3
8 = a (4)
a = 2
sehingga pers :
y = 2 (x+4)²+ 3
= 2 (x²+8x+16) + 3
= 2x²+16x+32+3
= 2x²+16x+35