Question

Show that : 13³-5³ is divisible by 8

Answer 1

Answer:

= 13³-5³

= (13-5)(13² + 65 + 25)

= 8*(169+90)

= 8*(259)

=> 259*8 is divisible by 8

Answer 2

Answer:

cube of 13 is 2197

and cube of 5 is 125

2197 - 125 equal to 2072

and when 2072 is divisible by 8 then we get

2072÷8=259

then we can say that 13 cube minus 5 cube is divisible by 8