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y = a (x-1)² + 4 --> mell (3,20) --> x = 3, y = 20
20 = a (3-1)² + 4
20-4 = a. 2²
4a = 16
a= 4
y = 4 (x-1)² + 4
y = 4 (x²-2x+1) + 4
= 4x²-8x+4+4
= 4x² - 8x + 8