how do you expand and simplify this equation?

Mathematics
Tutor: None Selected Time limit: 1 Day

the equation is (9a-5)^3 and the answer is: 729^3-1215a^2+675a-125. How do you get to the answer?

Sep 28th, 2014

(9a-5)3= (9a)3-3*(9a)2*5+3*(9a)*(52)-53

= 729a3-1215a2+675a-125 because 929 =9*9*9, 1215 =3*81*5 and 675 =3*9*25 


Sep 28th, 2014

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