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7 = 4 +2a +b
2a +b = 3 (pers 1)
-3 = (-2)^2 -2a + b
-3 = 4 -2a +b
2a - b = 7
2a +b = 3
2a - b = 7
2b = -4
b = -2
2a -(-2) = 7
2a + 4 = 7
2a = 3
a = 3/2
b. f(x) = x^2 + 3/2 x - 2