Square root of 7 squared+B squared equals 3 squared

Square root of 7 squared+B squared equals 3 squared
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?????????????? maebee yu wnat sqrt(7^2+b^2) =3^2 ??????????????

or sqrt(b^2+9)=9

then sqrare both sides...(b^2+9)=81

b^2=81-9=72

b=sqrt(72)

=8.485281374
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