Question

Determine m na função f(x) = x^2 - mx + 40 de 1/x' + 1/x'' = 7/8

Answer 1

Bom dia

$\frac{1}{x'} + \frac{1}{x''} = \frac{7}{8} \quad\Rightarrow\ \frac{x'+x''}{x'*x''} = \frac{7}{8} \quad\Rightarrow\ \frac{x'+x''}{40} = \frac{7}{8} \quad\ x'+x''=35$

logo m=35