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Mathematics
Problem
Factor *completely* the following expression. (That is, take out common factors, including leading negatives, if any, then factor what's left into binomials.)
−
28
x
4
y
5
+
63
x
3
y
6
+
91
x
2
y
7
-28x^4y^5 + 63x^3y^6 + 91x^2y^7
−
28
x
4
y
5
+
63
x
3
y
6
+
91
x
2
y
7
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