Question

No.12 pls solve fast it's urgent..do it Step by step pls

Answer 1

Answer:

Step-by-step explanation:

if log a =b  base is 10

we can write

a=10^b

here,

log(x^2-21)=2

x^2-21=10^2

x^2=100+21=121

x^2=121

x=+-root121

x=+-11

Answer 2

Step-by-step explanation:

2 can be written as log100

As we know that log10=1

So log100=2

Then taking antilog on both side

X2-21=100

X2=121

X=+_11