Calculate: (7m+4) \times (7m-6)

Expression: $\left( 7m+4 \right) \times \left( 7m-6 \right)$

$7m \times 7m-7m \times 6+4 \times 7m-4 \times 6$

$49{m}^{2}-7m \times 6+4 \times 7m-4 \times 6$

$49{m}^{2}-42m+4 \times 7m-4 \times 6$

$49{m}^{2}-42m+28m-4 \times 6$

$49{m}^{2}-42m+28m-24$

$49{m}^{2}-14m-24$