✨ Best Answer ✨
=[(x+y)+3][(x+y)-5]
ここで(X+3)(X-5)=X²-2X-15を思い出す
=(x+y)²-2(x+y)-15
=(x²+y²+2xy)-2x-2y-15
=x²+2xy+y²-2x-2y-15
✨ Best Answer ✨
=[(x+y)+3][(x+y)-5]
ここで(X+3)(X-5)=X²-2X-15を思い出す
=(x+y)²-2(x+y)-15
=(x²+y²+2xy)-2x-2y-15
=x²+2xy+y²-2x-2y-15
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