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f(x) = 2x2 + 4x - 7
y = 2(x - 1)2 + 3 y = 2(x - 1)(x - 1) + 3 y = 2(x2 - 2x + 1) + 3 y = 2x2 - 4x + 2 + 3 y = 2x2 - 4x + 5
2x2 + 3x - 20 = (x + 4)(2x - 5).
y=2x2-3x2-12x+5=0