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melalui titik(x1,y1) = (3, 12)
gunakan rumus y = a(x-p)² + q
y = a(x+1)² - 4 melalui (3,12)
12 = a( 3+1)² - 4
16 a = 16
a= 1
y= 1(x+1)² - 4
y = x²+ 2x + 1 - 4
y = x² + 2x - 3