Log at base10 x-2+ Log at base10 x +2 =Log at the base10 5

 

Asked by gursimarjitsinghrandhawa | 22nd Aug, 2019, 09:31: AM

Expert Answer:

log10 x - 2 + log10 x + 2 = log10 5
log10 (x - 2)(x + 2) = log10 5
(x - 2)(x + 2) = 5
x2 - 4 = 5
x2 = 9
x = ± 3
but x = -3 rejected
hence, x = 3

Answered by Sneha shidid | 22nd Aug, 2019, 09:41: AM