Answer :

irspow
a^2-64=0 you can factor like this:

(a+8)(a-8)=0 and since a>0, a must be 8

or you can do this:

add 64 to both sides of the equation leaving you with:

a^2=64  taking the square root of both sides

a=(-8,+8) and since a>0, a=8

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