Rozwiąż równanie (funkcja kwadratowa)   a)  100x^2 - 81 =0 b) 1/4 x^2 - 1/9 = 0 c) x^2 + 10x +25 = 0 d) x^2+64 = 16x e) 24x - x^2 = 144 f) 1 + 9x^2 + 6x = 0 BARDZO PROSZE !!  

a)  100x^2 - 81 =0 100x^2 = 81 x^2 = 81/100 x = 9/10   lub   x = -9/10   b) 1/4 x^2 - 1/9 = 0 1/4x^2 = 1/9   /*36 9x^2 = 4 x^2 = 4/9 x = 2/3   lub  x = -2/3   c) x^2 + 10x +25 = 0 (x + 5)^2 = 0 x + 5 = 0 x = -5   d) x^2+64 = 16x x^2 - 16x + 64 = 0 (x - 8)^2 = 0 x - 8 = 0 x = 8   e) 24x - x^2 = 144 -x^2 + 24x - 144 = 0 x^2 - 24x + 144 = 0 (x - 12)^2 = 0 x - 12 = 0 x = 12   f) 1 + 9x^2 + 6x = 0 9x^2 + 6x + 1 = 0 (3x + 1)^2 = 0 3x + 1 = 0 3x = -1 x = -1/3