SOLUTION: Solve this equation. sqrt(y+21)-1=sqrt(y+12)

Question 274968: Solve this equation.
sqrt(y+21)-1=sqrt(y+12)
Answer by user_dude2008(1862) (Show Source): You can put this solution on YOUR website!
sqrt(y+21)-1=sqrt(y+12)

(sqrt(y+21)-1)^2=y+12

y+21-2*sqrt(y+21)+1=y+12
10=2*sqrt(y+21)
100=4(y+21)
100=4y+84
4y=16
y=4

Answer: y=4
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