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c²=(2+2√2+c)²-4√2-4
c²=c²+(4+4√2)c+(2√2+2)²-4√2-4
(4+4√2)c+8+4+8√2-4√2-4=0
(4+4√2)c=-4√2-8
(1+√2)c=-√2-2
c=-(√2+2)/(√2+1)
c=-【(√2+2)(√2-1)】/(2-1)
c=-(2+2√2-√2-2)
c=-√2
c²=c²+(4+4√2)c+(2√2+2)²-4√2-4
(4+4√2)c+8+4+8√2-4√2-4=0
(4+4√2)c=-4√2-8
(1+√2)c=-√2-2
c=-(√2+2)/(√2+1)
c=-【(√2+2)(√2-1)】/(2-1)
c=-(2+2√2-√2-2)
c=-√2
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