Question

va rog sa ma ajutati...este urgent...ex 5..rezolvati pe o foaie si face-ti o poza...multumesc

Answer 1

√7²=√49=7; ⇒lxl=+₋7 
√x²=√8²=√64=8⇒x=+,-8
√x²=√13²=13⇒x=+13,-13
√x²=37⇒x=+37sau -37, adica √37²=37
√x²=131⇒x=131,sau -131;  deoarece √131²=131
√x²=253⇒x=+253,sau -253; deoarece √253²=253

Answer 2

[tex]\it a)\ \sqrt{x^2} = 7 \Rightarrow |x| =7 \Rightarrow x = \pm7 \\\;\\ b)\ \sqrt{x^2} = 8 \Rightarrow |x| =8 \Rightarrow x = \pm8 \\\;\\ c)\ \sqrt{x^2} = 13 \Rightarrow |x| =13 \Rightarrow x = \pm13 [/tex]