Question

42 +6=144
51+4=256
74+7=441
84+9=​

Answer 1

first line (4-2)×6= 2×6 = 12 =12^2 =144

second line (5-1)×4=4×4= 16 = 16^2 =256

third line (7-4)×7 = 3×7 = 21 = 21^2 =441

fourth line (8-4)×9=4×9= 36 = 36^2 =1296