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y = a (x - p)² + q
-3 = a (2 - 1)² + 4
-3 = a + 4
a = -3 - 4
a = -7
y = a (x - p)² + q
= -7 (x - 1)² + 4
= -7 (x² - 2x + 1) + 4
= -7x² + 14x - 7 + 4
y = -7x² + 14x - 3