Question

Se x+y =20 e x-y=5 calcule log (x²-y²)






a)6
b)9
c)1
d)2
e) 3​

Answer 1

$\sf log (x {}^{2} -y {}^{2} ) \\ \\ \sf log \left((x + y) \cdot(x - y) \right) \\ \\ \sf log(20 \cdot5) \\ \\ \boxed{\boxed{ \sf d) \: log(100) = 2}}$