Question

(4b-4)(4b +4)-4b(4b+4) при b=6

Answer 1

(4×6-4)×(4×6+4)-4×6×(4×6+4)=20×28-4×6×28=560-672=112

Answer 2

=16b²+16b-16b-16-16b²-16b=-16-16b
-16-16b=-16-16*6=-16-96=-112