Объяснение:
a) D = 4^2 - 4*1*3= 16-12=4
x1= -b-sqrt(D)/2a= 4-2/2=1
x2= -b+sqrt(D)/2a= 4+2/2=3
b) D=9*2-4*1*0= 81
x1= -9-9/2=-9
x2=-9+9/2=0
c) D= 1+4*7*8= 225
x1= 1-15/14=-1
x2=1+15/14=16/14=8/7
d) D= 0^2 + 4*2*50= 400
x1= 0-20/4=-5
x2=0+20/4=5
