Question Number 49236 by cesar.marval.larez@gmail.com last updated on 04/Dec/18
$${Let}\:{K}\:{be}\:{a}\:{field}\:{and}\:{a},{b}\in{K}.\:{Show}\: \\ $$$${that}\:\left({x}−{a}\right)\left({x}−{b}\right)\:{if}\:{and}\:{only}\:{if}\:{a}={b} \\ $$
Commented by kaivan.ahmadi last updated on 05/Dec/18
$$\left(\mathrm{x}−\mathrm{a}\right)\left(\mathrm{x}−\mathrm{b}\right)=? \\ $$
Commented by cesar.marval.larez@gmail.com last updated on 05/Dec/18
$${yes}\:{friend} \\ $$