(4-√2)^2 + 4√8 = (4-√2)(4-√2)+ 4√8= 16 -4√2 -4√2 + (√2)^2+ 4√8= 16 - 8√2 + 2 +4√8= 16 - 8√2+2+4√2*4= 16 - 8 √2+2+4*2√2= 16 -8 √2+2 - 8 √2 = 16+2=18
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(4-√2)^2 + 4√8 = (4-√2)(4-√2)+ 4√8= 16 -4√2 -4√2 + (√2)^2+ 4√8= 16 - 8√2 + 2 +4√8= 16 - 8√2+2+4√2*4= 16 - 8 √2+2+4*2√2= 16 -8 √2+2 - 8 √2 = 16+2=18