5 x2 4 July 8, 2019 16 32 64 128 5 x2 4x 1 5 5x2 4 5 4 x2 3 3x 5 x2 4x 7 Y 5 4x x2 X2 4x 5 factorise X2 4x 5 0 quadratic equation X2 4x 5 0 quadratic formula X2 4x 5 0 дискриминант X2 4x 5 graph X2 4x 5 x 1 X2 4x 5 ≤ 0 X2 4x 5 2 X2 5 4 0 Y 5 x2 4