Question

please answer fast please please pleaseplease answer fast please please please please

Answer 1

Step-by-step explanation:

14.

$i)25 {x}^{2} + 196 {y}^{2} - 420xy$

$= 25 \times( {2)}^{2} + 196 \times ( {3)}^{2} - 420 \times 2 \times 3$

$= 25 \times 4 + 196 \times 9 - 2520$

$= 100 + 1764 - 2520$

$= 1864 - 2520$

$= - 656$