Factorise 27 y cube + 125 z cube
Answers
Answered by
1
27Y3+125z3
(3Y)^3+(5z)^3
now use a^3+b^3
if you dont know identity search on google.
(3Y)^3+(5z)^3
now use a^3+b^3
if you dont know identity search on google.
Answered by
5
27y³+125z³
using the identity:-
a³+b³=(a+b)(a²+b²-ab)
(9y)³+(5z)³=
(9y+5z)[(9y)²+(5z)²-(9y×5z)]
(9y+5z)[81y²+25z²-45yz]
9y(81y²+25z²-45yz)+5z(81y²+25z²-45yz)
729y³+ 225yz²- 405zy²+ 405zy² + 225z³- 225yz²
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