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Does anyone know this and if it is extraneous or not?
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1 vote
Does anyone know this and if it is extraneous or not?

Does anyone know this and if it is extraneous or not?-example-1
User Chan Yung Keat
by
7.8k points

1 Answer

2 votes
addd 4 to both sides

√(x+9)=5
sqare both sides
x+9=25
minus 9 both sides
x=16

plug it in for x and see

√(16+9)-4=1

√(25)-4=1

5-4=1
1=1
true

not extraneous
an extraneous root would be x=-34
User Pattie
by
7.5k points
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