2*(x+3)do 2 = (x-3)do 2 -4x Prosze O Wszystkie Obliczenia

2*(x+3)² = (x-3)² -4x Stosuję wzór skróconego mnożenia (a + b)² = a² + 2*a*b + b² oraz                                                      (a - b)² = a² - 2*a*b + b²   2*(x² + 6x + 9) = (x² -6x +9 )- 4x 2x² +12x +18 = x² -6x +9 -4x 2x² +12x +18 = x² -10x +9 2x² +12x +18 -x² +10x -9 = 0 x² +22x +9 = 0 a= 1 b = 22 c = 9 ∆ = b² - 4ac = 22² -4*1*9 = 484 -36 = 448   √∆ = √448 =  √64* √7 = 8√7 x1= (-b - √∆):2a = (-22 -8√7) : 2*1 = -11 -4√7 x2 =(-b + √∆):2a = (-22 + 8√7) : 2*1 = -11 +4√7