Решите уравнение: а)x^2+2=3-x б)5x+2=2-2x^2 в)2x^2+3=3-7x г)x^2-6x=4x-25 д)x^2+2x=16x-49

1) x² + 2 - 3 + x = 0 x² + x - 1 = 0 D = b² - 4ac = 1 - 4×(-1) = 5 x1,2 = ( - 1 + √5) / 2 2) 5x + 2 - 2 + 2x² = 0 2x² + 5x = 0 x( 2x + 5) = 0 x =0 2x + 5 = 0 2x =- 5 x =- 2,5 3) 2x² + 3 - 3 + 7x = 0 2x² + 7x = 0 x( 2x + 7) = 0 x = 0 2x+ 7 = 0 2x = - 7 x = - 3,5 4) x² - 6x - 4x + 25 = 0 x² - 10x + 25 = 0 D = b² - 4ac = 100 - 4×25 = 0 - имеет один корень. x= - b/2a x = 10/2 x = 5 5) x² + 2x - 16x + 49 = 0 x² - 14x + 49 = 0 D = b² - 4ac = 196 - 4×49 = 0 - имеет один корень. x =- b/2a x = 14/2 x = 7