find the sum 2x²+xy-y² , -x²+2xy+3y² , 3x²-3x+1
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2
Answer:
5x
2
−2xy+3y
2
,−2x
2
+5xy+9y
2
and 3x
2
−xy−4y
2
It can be written as
= 5x
2
−2xy+3y
2
,−2x
2
+5xy+9y
2
+3x
2
−xy−4y
2
By further calculation
5x
2
−2xy+3y
2
,−2x
2
+5xy+9y
2
3x
2
−xy−4y
2
So we get
=6x
2
+2xy+8y
2
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