Question

1)

156^2-156*34+178*156

2)

62^2-22^2

25^2-15^2

Answer 1

$1)156^2-156*34+178*156=156(156-43+178)=\=156*300=46800$

 

$2-1)62^2-22^2=40*84=3360$

 

$2-2)25^2-15^2=10*40=400$