Question

Is Negative square root of 0.9 rational

Answer 1

`\mathrm{No\ the\ negative\ square\ root\ of\ 0.9\ is\ not\ rational.\ A\ rational\ number\ is\ a}\\\mathrm{real\ number\ which\ can\ be\ expressed\ in\ form\ of\ (p)/(q),\ where,\ p,q\ \epsilon\ Z,\ q\\e0.}\\\mathrm{But\ -√(0.9)\approx-0.9487,\ which\ cannot\ be\ expressed\ in\ terms\ of\ fractions.}`

`\mathrm{Other\ examples\ of\ such\ irrational\ numbers\ are:\ \pi,\ \sqrt3,\ \sqrt7,\ e,\ etc.}`