1)16+8x+x^2-x^2=0
8(2+x)=0
2)(2x+5)^2-(2x+3)^2=2
(2x+5-2x-3)(2x+5+2x+3)=2
2(4x+8)=2
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1)16+8x+x^2-x^2=0
8(2+x)=0
2)(2x+5)^2-(2x+3)^2=2
(2x+5-2x-3)(2x+5+2x+3)=2
2(4x+8)=2