Elitmus
Exam
Numerical Ability
Arithmetic
log6 (x^2-6x+9)^1/2 +log6(x^2-4x+16)=1
Find the no of real solution.
a.)4 b.)2 c.)3 d.)0
note:-here log of base 6.
Read Solution (Total 5)
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- there is abit of mistake in the given ques... both terms contains power 1/2
its log6(x-3)(x-4)=1
x^2-7x+12=6
x^2-7x+6=0
x=1,6
Hence 2 real solutions... - 10 years agoHelpfull: Yes(2) No(1)
- log6 (x^2-6x+9)^1/2 +log6(x^2-4x+16)=1
=>log6 (x-3)^2 + log6 (x^2-4x+16) = 2
=> (x-3)^2(x^2-4x+16) = 6^2
=> for real solutions
=> (x-3)^2=6^2
=> x-3 = 6 and x-3 = -6
=> x=9,-3
Hence 2 real solutions - 10 years agoHelpfull: Yes(1) No(4)
- option b) 2
was not in option - 10 years agoHelpfull: Yes(1) No(0)
- i think it will have 5 solns
- 10 years agoHelpfull: Yes(0) No(0)
- d
log6(x-3)+log6(x^2-4x+16)=1
log6(x-3)(x^2-4x+16)=1
(x-3)(x^2-4x+16)=1
it is not possible to get any solution
- 10 years agoHelpfull: Yes(0) No(0)
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