Question

Solve :
$(7+m{)}^3$

Answer 1

We have,

$(7+m{)}^3$

$\Rightarrow 7^3+m^3+3\times 7\times m(7+m)$

$\Rightarrow 343+m^3+21m(7+m)$

$\Rightarrow 343+m^3+147m+21m^2$

Hence, this is the answer.