★ Exponential reduction ★
[tex]x {}^{2} - 9 = 55 \\ x {}^{2} = 55 + 9 = 64 \\ x {}^{2} = 64 = ( + 8) {}^{2} \\ x = + 8 \\ [/tex]
we didn't considered -8 because square root of any real number is always positive , or it's yours choice to deal with minus 8 also :)
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