Given that the vertex coordinates of the quadratic function y = (a + 2) x & # 178; + A & # 178; - 1 are (0,3), then a=_____

Given that the vertex coordinates of the quadratic function y = (a + 2) x & # 178; + A & # 178; - 1 are (0,3), then a=_____

Substituting (0,3) into y = (a + 2) x & # 178; + A & # 178; - 1, we get 3 = A & # 178; - 1, a & # 178; = 4, we get a = 2 or - 2, because when a = - 2, y = (a + 2) x & # 178; + A & # 178; - 1 = 3, which is not satisfied, so we know that the vertex coordinate of quadratic function y = (a + 2) x & # 178; + A & # 178; - 1 is (0,3), then a=_ 2__ ...