Решите плииииз:* x+корень из{x} -20=0. Created by KitKat23. algebra-ru

Решите плииииз:* x+корень из{x} -20=0...

July 2022 1 8 Report

Решите плииииз:* x+корень из{x} -20=0

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$x+\sqrt{x}-20=0\\\\ t=\sqrt{x}\\\\ t^{2}+t-20=0\\ D=b^{2}-4ac=1^{2}-4\cdot1\cdot(-20)=81\\\\ x_{1,2}=\frac{-b+/-\sqrt{D}}{2a}\\\\ x_{1}=\frac{-1+9}{2}=4\\\\ x_{2}=\frac{-1-9}{2}=-5$

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