pythagoras variable equations?

9x squared+2=7x squared+48

answer key answered +4.80....
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1 Answer

9x^2+2=7x^2+48, subtract 7x^2 from each side, then subtract 2 from each side: 2x^2=46, halve each side: x^2=23, x=sqrt(23)=4.796 approx. Also -4.796.
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