Question

solve for log x +log(x-21)=2

Answer 1

simplify for left side by using the property of log,
log x +log(x-21) = log x(x-21)

Answer 2

setting 2 be log 100

Answer 3

now u have an equation :

log x(x-21) = log 100
cancel the log from both sides,
x(x-21) = 100
x^2 - 21x - 100 = 0
solve for x

Answer 4

@hperkins
u can use by factoring or complete squares, also using the quadratic formula