Помогите пожалуйста. Срочно​

N1.

3x²-x-2 = 0

D = 1+2*4*3 > 0

2 корня

16x²+8x+1 = 0

D = 64-16*4 = 0

1 корень

x²+6x+10 = 0

D = 36-10*4 < 0

корней нет

N2.

1) x²+6x+5 = 0

D = 36-5*4 = 16 = 4²

x=(-6±4)/2

x1 = -5

x2 = -1

2) 2x²-5x+3 = 0

D = 25-2*3*4 = 1

x = (5±1)/4

x1 = 1

x2 = 1,5

3) 2x²-7x-4 = 0

D = 49-2*4*4 = 49+32 = 81 = 9²

x = (7±9)/4

x1 = -0.5

x2 = 4