Problem

35
Solve for x :
log(x)+log(x+2)=2

Answer

Expert–verified
Hide Steps
Answer

x=1+101 is the only solution

Steps

Step 1 :log(x(x+2))=2

Step 2 :log(x2+2x)=2

Step 3 :102=x2+2x

Step 4 :100=x2+2x

Step 5 :x2+2x100=0

Step 6 :x=2±(2)24(1)(100)2(1)

Step 7 :x=2±4+4002

Step 8 :x=2±4042

Step 9 :x=1±101

Step 10 :Check the solutions in the original equation

Step 11 :x=1+101 is a valid solution

Step 12 :x=1101 is not a valid solution

Step 13 :x=1+101 is the only solution

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