Question

Factorise:$(6 2/3)^2 - (2 1/3)^2$

Answer 1

$(6 2/3)^2 - (2 1/3)^2$

$= (20/3)^2 - (7/3)^2$

$= (20/3 + 7/3)(20/3 - 7/3)$

$= (27/3)(13/3) = 9 xx 13/3 = 39$