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(37 +1)²
38²
(40 -2)²
40² -2.40.2 +2²
1600 -160 +4
1440 +4
1444
b. 58² +232 +4
(58 +2)²
(60)²
3600
c. 27² -100 +4
27² -96
(30 -3)² -96
30² -2.30.3 +3² -96
900 -180 +9 -96
633
b. 58^2 + 232 + 4 = 58.58 + 4.58 + 4 = 58 (58+4) + 4 = 58 (62) + 4 = 3.596 + 4 = 3.600
c. 27^2 - 100 + 4 = 27.27 - 96 = 27.27 - 81 - 15 = 27.27 - 3.27 - 15 = 27 (27-3) - 15 = 27 (24) - 15 = 648 - 15 = 633