35Solve for x :log(x)+log(x+2)=2
x=−1+101 is the only solution
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+2x−100=0
Step 6 :x=−2±(2)2−4(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=−1−101 is not a valid solution
Step 13 :x=−1+101 is the only solution