Question

Log(x^2-21) =2 , solve for x

Answer 1

Step-by-step explanation:

As base = 10

then 10^2=x^2-21 [ converting it into exponential form]

x^2-121=0

(x)^2-(11)^2 = 0

(X+11)(x-11) = 0

X= +11 or -11