(x+2y)²-(x-2y)² dla x= √2 a y= -√2.... Question from @paulix6

August 2018 2 13 Report

(x+2y)²-(x-2y)² dla x= √2 a y= -√2

kaczys (x+2y)²-(x-2y)²=(√2+2*[-√2])²-(√2-2*[-√2])²=2-8-2+8=0

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MARCIN123456789 [√2+2(-√2)]²-[√2-2(-√2)]²
[2+0-(-2)] - (2-4√2-2)
4-4√2

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