$$(3^{2} \times 4^{2} \times 5) \div 36 = (?)^{2} - 80$$
$$(3^{2} \times 4^{2} \times 5) \div 36 = (?)^{2} - 80$$
$$(9\times 16 \times 5) \div 36 = (?)^{2} - 80$$
$$(720) \div 36 = (?)^{2} - 80$$
$$20+80 = (?)^{2} $$
? = -10 or 10
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