uprość wyrażenie i oblicz
2(x-y)^2 - (x+y)(x-y) +4xy =
dla x= pierwiastek z 7
y= pierwiastek z 6
2(x²-2xy+y²)-(x²-y²)+4xy=2x²-x²+2y²+y²-4xy+4xy=x²+3y²
x²+3y²=(√7)²+3*(√6)²=7+3*6=7+18=25
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2(x²-2xy+y²)-(x²-y²)+4xy=2x²-x²+2y²+y²-4xy+4xy=x²+3y²
x²+3y²=(√7)²+3*(√6)²=7+3*6=7+18=25