Question

plz anwer this question ​

Answer 1

Answer:

a.

=(20+12)(20-9)

=20×20 - 20×9 + 20×12 - 12×9

=400 - 180 + 240 - 108

=640 - 288

= 352

b.

= (30+25) (30-17)

=30×30 - 30×17 + 25× 30 - 25×17

= 900 - 510 +750-425

=1650-935

=715

c.

= (150-49) (150+52)

=150×150 + 150×52 - 49×150 - 49× 52

= 22500 + 7800 - 7350 - 2548

= 20402

Step-by-step explanation:

i think this is your answer .