Prove that 𝑓(𝑥) = 𝑥 2 + 2𝑥 is not injective
Given,
The solution of the above equation is-
which is defined in R for This can be used to separate the domain of f(x) into two intervals. For ) and , the function f(x) is not injective (and invertible). The domain that contains 2 is of course
Comments