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a² - b² = 42
Con suma por su diferencia :
(a+b)(a-b) = 42
Sabemos el valor de (a+b) = 7
Sustituimos :
7(a-b) = 42
(a-b) = 42/7
(a-b) = 6
Salu2 :).
Aplicas productos notables.
a² - b² =
(a + b)(a - b)
a² - b² = 42
(a + b)(a - b) = 42 Pero a + b = 7
7(a- b) = 42
(a - b) = 42/7
(a - b) = 6
Respuesta.
a - b = 6