SOLUTION: Find the fourth term in the expansion of (5x + 3y)^7 Not sure how to do this one.

Question 615882: Find the fourth term in the expansion of (5x + 3y)^7
Not sure how to do this one.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Find the fourth term in the expansion of (5x + 3y)^7
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4th term = 7C4[(5x)^4*(3y)^3] = 35*625x^4*27y^3 = 590625x^4y^3
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Cheers,
Stan H.
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