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P(-2,4) --> y = a(x+2)² + 4
kurva melalui (x,y) = (-4,0) --> 0 = a(-4+2)² + 4
0 = a(-2)²+4
0 = 4a +4
4a = - 4
a = - 1
persamaan kurva --> y = a(x+2)²+4 dan a = -1
y = -1(x+2)² + 4
y = -x² - 4x - 4 + 4
y = -x² - 4x