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LogicalApple
 2 years ago
Best ResponseYou've already chosen the best response.0Are you familiar with the Binomial Theorem and Pascal's Triangle ?

LogicalApple
 2 years ago
Best ResponseYou've already chosen the best response.0I suggest a little research on it because it comes in handy. Remember that the r^4 term will also have a 4^4 term because 4 is already a coefficient of r. Basically what it tells us is that the 4^4 * r^4 * s^3 term is the fourth term (counting backwards from the exponent 7, we get : 7, 6, 5, 4 ,totaling four terms. The binomial coefficient then of the fourth term is: \[\left(\begin{matrix}7 \\ 4\end{matrix}\right) = 35\] Since we already have a 4^4 term, we multiply 4^4 * 35 = 8960 Thus the coefficient is 8960. Some research for Binomial Theorem (http://www.purplemath.com/modules/binomial.htm)
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