Question

            ___

1)   3*/x-7 =9

       ____      ___

2) /2x-6  +/ x-3 =0

Answer 1

1.

$\3sqrt{x-7}=9\ x-7geq0\ xgeq7\\ 3sqrt{x-7}=9\ sqrt{x-7}=3\ x-7=9\ x=16$

 

2.

$\sqrt{2x-6}+sqrt{x-3}=0\ 2x-6geq 0 wedge x-3geq 0\ 2xgeq6 wedge xgeq3\ xgeq 3wedge xgeq 3\ xgeq3\\ sqrt{2x-6}+sqrt{x-3}=0\ sqrt{2x-6}=-sqrt{x-3}\ 2x-6=x-3\ x=3$

Answer 2

решение на картинках

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