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= 58² + 2(58)(2) + 2²
= (58+2)²
= 60²
= 3600
b. 27² - 100 + 4
= (25+2)² - 2(25)(2) + 4
= 25² + 2(25)(2) + 2² - 2(25)(2) + 4
= 25² + 2² + 4
= 625 + 4 + 4
= 633