Gleichung lösen: (x + 3) (x - 2) = x (x + 4) - 21

Question

(x + 3) (x - 2) = x (x + 4) - 21 , suche die lösung

Answer 1

(x + 3) (x - 2) = x (x + 4) - 21; //ausmultiplizieren

x^2 +x -6 = x^2 +4x -21; // -x^2, -x, +6

0 = 3x -15; // +15

3x = 15; // /3

x = 5;