Question

siendo m-n=5
mn=7
calcule m² + n²​
A)25
B)35
C)39
D)2

Answer 1

Respuesta:

39

Explicación paso a paso:

$m - n = 5 \\ {(m - n)}^{2} = {(5)}^{2} \\ {m}^{2} + {n}^{2} - 2mn = 25 \\ {m}^{2} + {n}^{2} - 2(7) = 25 \\ {m}^{2} + {n}^{2} = 25 + 14 \\ {m}^{2} + {n}^{2} = 39$