Kak tolong bantu kami Memgerjakan tugas matematika

Kak tolong bantu kami Memgerjakan tugas matematika

${x}^{2} - 2x - 3 = 0 \ (x - 3)(x + 1) = 0 \ x1 = 3 : dan : x2 = - 1$
$sehingga: x1+x2= 3+(-1) = 2 \ x1 × x2 = 3×(-1) = (-3) \ {x1}^{2} + {x2}^{2} = {3}^{2} + {( - 1)}^{2} = 9 + 1 = 10 \ {x1}^{2} - {x2}^{2} = {3}^{2} - {( - 1)}^{2} = 9 - 1 = 8 \ frac{1}{x1} + frac{1}{x2} = frac{1}{3} + frac{1}{( - 1)} = frac{( - 1) + 3}{( - 3)} = - frac{2}{3} \ frac{x1}{x2} + frac{x2}{x1} = frac{3}{( - 1)} + frac{( - 1)}{3} = frac{9 +1}{ - 3} = - frac{10}{3}$