x1=-15
x2=21
Объяснение:
x2-6x-280=0
a=1 b= -6 c= -280
D= b2-2ac= 36 - 4 * 1 * (-280)= 36+1120=1156
x= -b +- √D / 2a
x1=6-36/2 = -30/2 = -15
x2=6+36/2=21
x1=-15
x2=21
Объяснение:
x2-6x-280=0
a=1 b= -6 c= -280
D= b2-2ac= 36 - 4 * 1 * (-280)= 36+1120=1156
x= -b +- √D / 2a
x1=6-36/2 = -30/2 = -15
x2=6+36/2=21