5x^2+5x-2=0 и 6x^2-8x-4=0 помогите пожалуйста

5x^2 + 5x - 2 = 0 D = b^2 - 4ac = 25 + 40 = 65 x1,x2 = ( - 5 +/-√65) / 10 6x^2 - 8x - 4 = 0 D = b^2 - 4ac = 64 + 96 = 160 x1 = ( 8 + 4√10) / 12 = 4( 2 + √10) / 12 = (2 + √10) / 3 x2 = ( 8 - 4√10) / 12 = 4( 2 - √10) / 12 = ( 2 - √10)/ 3