Ax ^ 2 + BX + C = 0, if a + B + C = 0, then there must be a root of?

Ax ^ 2 + BX + C = 0, if a + B + C = 0, then there must be a root of?


The solution of ax ^ 2 + BX + C = 0 is x1, 2 = [- B ± √ (b ^ 2-4ac)] / 2a, if one root is 1, then [- B ± √ (b ^ 2-4ac)] / 2A has one root is 1, that is √ (b ^ 2-4ac) or - √ (b ^ 2-4ac) = the square of both ends of 2A + B to get B ^ 2-4ac = 4A ^ 2 + 4AB + B ^ 2 to simplify to get a + B + C = 0