Complex and Imaginary Numbers (Add, Subtract, Multiply, Divide, Standard a+bi form)

[@danielbalcazar6792]

hola profe gracias por explicar de la forma en la que lo haces

[@nebiyusamuel6545]

Which of the following line is not tangent to the graph of f(x)= x^2+1 at the point(s) of intersection of the graph of f(x) and the line x-y+3=0? A)2x+y=0 b)2x-y=0 c)4x+2y=0 d)4x-y-3=0

[@nebiyusamuel6545]

Pls help me in this question