Question 804824
when you add logs together it is the same as multiplying the numbers u are logging.
example:
loga+logb=log(ab)
You need to do this to this problem
{{{log(x)+log(x+21)=2}}}
{{{log(x(x+21))=2}}}
when log doesn't have a number where the base should be, it means the base is zero.
turn this into an exponential equation.
{{{10^2=x(x+21)}}}
{{{100=x^2+21x}}}
{{{0=x^2+21x-100}}}
Now factor the equation.
{{{(x-25)(x+4)=0}}}
x= 25, -4