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OpenStudy (anonymous):
Expand (x + y)6. A. x6 - 6x5y + 15x4y2 - 20x3y3 + 15x2y4 - 6xy5 + y6 B. x6 + 6x5y + 15x4y2 + 20x3y3 + 15x2y4 + 6xy5 + y6 C. x6 - 6x5y - 15x4y2 - 30x3y3 - 15x2y4 - 6xy5 - y6 D. x6 + 6x5y + 15x4y2 + 30x3y3 + 15x2y4 + 6xy5 + y6 I'm pretty sure it's C am I right?
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jimthompson5910 (jim_thompson5910):
No, it's not C. Notice how there isn't a negative anywhere to be found in the original expression.
OpenStudy (pfenn1):
Well, without going through the whole cumbersome multiplication, I can tell you that it cannot be A or C because there are no negative numbers in this multiplication.
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