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Please help me, this is quite hard

Please Help Me This Is Quite Hard class=

Sagot :

[tex]d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\\\\ d=\sqrt{(-7-(-1))^2+(6-(-2))^2}\\ d=\sqrt{(-6)^2+(8)^2}\\ d=\sqrt{36+64}\\ d=\sqrt{100}\\ d=10[/tex]