Question

(21h+13m)² ...............................ayudaaa​

Answer 1

Usamos el ( a + b)² = a² + 2 ab + b²

$(21h {)}^{2} + 2 \times 21h \times 13m + (13m {)}^{2}$

elevamos el factor a la potencia

$441 {h}^{2} + 2 \times 21h \times 13m + (13m {)}^{2}$

calculamos

$441 {h}^{2} + 546hm + (13m {)}^{2}$

elevamos el factor a la potencia

$441 {h}^{2} + 546hm + 169 {m}^{2}$