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Lro
@Lro
December 2019
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Sabendo que a + b = 32 e a – b = 10, Calcule a² - b²
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LucasDiehl
Primeiro devemos descobrir o numero de 'a' e 'b', e descobrimos atraves de um sistema:
a+b=32
a-b=10
----------
2a+0b=42
2a=42
a=21
Usamos o valor de 'a' para achar o valor de 'b':
a-b=10
21-b=10
b=11
Entao, com a=21 e b=11, a² - b² é:
21² - 11² =
441-121=
320
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Lista de comentários
a+b=32
a-b=10
----------
2a+0b=42
2a=42
a=21
Usamos o valor de 'a' para achar o valor de 'b':
a-b=10
21-b=10
b=11
Entao, com a=21 e b=11, a² - b² é:
21² - 11² =
441-121=
320