0

Guest

Courses New

1. LOG(x-1)(base 4) = LOG(x-3)(base 2) solution for 'x' 2. if logx(base 8) + log(x-4)(base 8) +log(x-6)(base 8) =2then x= ? saumya shivhare

1. LOG(x-1)(base 4) = LOG(x-3)(base 2)  solution for 'x'


2. if logx(base 8) + log(x-4)(base 8) +log(x-6)(base 8) =2then x= ?


saumya shivhare

Grade:11

2 Answers

Aniket Patra
48 Points
13 years ago

Ans 1 is most probably 2 and 5.

palash ahuja
19 Points
13 years ago

ist question solution is here 

log(x-1)base4 = 1/2 log(x-1)(base2)

therefore 

1/2log(x-1)base2 = log(x-3)(base2)

therefore 

log(x-1)base2 = 2log(x-3)base2 = log(x-3)^2(base2)

since both sides have the same base therefore we can remove the log 

we get

(x-1)=(x-3)^2 = x^2 - 6x +9

on solving further we get

x^2-7x+10=0

x^2-2x-5x+10=0

x(x-2) -5(x-2)=0

(x-5)(x-2)=0

or x=5 or x=2 

 

iind solution is here

logx(base8)+log(x-4)base8+log(x-6)base8=2

then 

log x(x-4)(x-6)(base8)=2

or 

x(x-4)(x-6)=64

on solving we get a cubic equation

x^3 -10x^2 +24x - 64=0

let the roots of the given eq. be a,b and c

then a + b+c= 10

& abc = 64

now by a.m.-g.m. inequality we get

(a+b+c)> Or = 3(abc)^1/3 = 3*4 = 12

which is less than a+b+c 

hence no solutions are possible 

i hope you have understood the solutions 

PALASH AHUJA 

 

Think You Can Provide A Better Answer ?

Other Related Questions on Algebra

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More