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$2^{2x^2+12x-5} + 3 (2^{x^2+7x+1}) - 2^{2x+9} = 0$


$2[2^{2x^2+12x-6} + 3 (2^{x^2+7x}) - 4 (2^{2x+6})] = 0$


ให้ $a = 2^{x^2+6x-3} , b = 2^{x+3}$ จะได้ $ab = 2^{x^2+7x}$


$2(a^2 + 3 ab - 4 b^2) = 0$