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Multiply:
(3x
2
y – 5xy
2
) × (
x
2
+
y
2
)
= 3x
2
y (
x
2
+
y
2
) – 5xy
2
(
x
2
+
y
2
)
=
x
4
y + 3x
2
y
3
– x
3
y
2
+
xy
4
14
x2 + 
y2)
x2 + 
y2) – 5xy2 (
x2 + 
y2)
x4y + 3x2y3 – x3y2 + 
xy4x2 + y2)x2 + y2) – 5xy2 (x2 + y2)x4y + 3x2y3 – x3y2 + xy4