Question

si a+b/a-b=7/3 y a*b=90 halla b

Answer 1

Respuesta:

$\frac{a + b}{a - b} = \frac{7k}{3k} \\ ab = 90 \\ a + b + a - b = 10k \\ 2a = 10k \\ a = 5k \\ b = 2k \\ ab = 90 \\ 5k \times 2k = 90 \\ 10 {k}^{2} = 90 \\ {k}^{2} = 9 \\ k = 3 \\ respuesta = b = 2k = 2(3) = 6$