Tuesday, March 6, 2018

algebra precalculus - Prove no real roots exist for factored cubic function

$6x^3-18x^2-6x-6$ can be expressed as $6(x-3.383)(x^2+ax+b)$ where $a,b \in \Bbb{R}$, how would you prove that $(x^2+ax+b)$ has no real roots?

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analysis - Injection, making bijection

I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...