a^2+8a+16=a^2+2*()*()+()^2=()^2

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a^2+8a+16=a^2+2*()*()+()^2=()^2a^2+8a+16=a^2+2*()*()+()^2=()^2a^2+8a+16=a^2+2*()*()+()^2=()^2a^2+8a+

a^2+8a+16=a^2+2*()*()+()^2=()^2
a^2+8a+16=a^2+2*()*()+()^2=()^2

a^2+8a+16=a^2+2*()*()+()^2=()^2
a^2+8a+16=a^2+2*(4)*(a)+(4)^2=(a+4)^2