Question

In sitemul cartezian xoy, determinati coordonatele simetriculuioriginii fata de dreapta de ecuatie x-2y-1=0. Multumesc!

Answer 1

Răspuns:

$a = 1 \\ b = - 2 \\ c = - 1 \\ b {}^{2} - 4 \times a \times c = ( - 2) {}^{2} - 4 \times 1 \times ( - 1) = 4 + 4 = 8 = \sqrt{8} \\ x1 = - \sqrt{8} \\ x2 = \sqrt{8} \\ a( - \sqrt{8} . \sqrt{8} )$