Question

log x - log(x+90)= -1

log 2(x^{2} + 6x+17)=3

Answer 1

logx-log(x+90)=-1

log(x/(x+90))+1=0

log(x/(x+90))+log10=0

log(x/(x+90))*10=log1

10x/x+90=1

10x=x+90

9x=90

x=10