1) log5(30-x)=2
30-x=5^2
30-x=25
-x=25-30
-x=-5 |: -
x=5
2) lg(x^2+19)=2
x^2+19=10^2
x^2=100-19
x^2=81
x= +- корень из 9
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Answers & Comments
1) log5(30-x)=2
30-x=5^2
30-x=25
-x=25-30
-x=-5 |: -
x=5
2) lg(x^2+19)=2
x^2+19=10^2
x^2=100-19
x^2=81
x= +- корень из 9