Question

Factorise 273 − 343^3​

Answer 1

Answer:

$273 - {343}^{3} \\ = 7 \times 39 - {343}^{3} \\ = 7 \times 39 - ({ {7}^{3} })^{3} \\ 7 \times 39 - {7}^{9 } \\ =7 (39 - {7}^{8} )$

=

7(39-5764801)

=7(5764762)

=40353334