Respuesta:
√ ( 13² - ( 4 x 1 x 40 ) ) = √ ( 169 - 160 ) = √9 = 3
√ ( 3² - ( 4 x 1 x 2 ) ) = √ ( 9 - 8 ) = √1 = 1
√ ( 40² - ( 4 x 4 x 96 ) ) = √ ( 1600 - 1536 ) = √64 = 8
√ ( 81² - ( 4 x 9 x 126 ) ) = √ ( 6561 - 4536 ) = √2025 = 45
