ответ: 16 1/3.
Объяснение:
49х^2-4х+с=0
a=49, b=-4, c=?
D=(-4)^2-4*49*c=16-196c
x1=(-(-4)+sqrt(D))/2*49=4/98+sqrt(16-196c)/98
x2=(-(-4)-sqrt(D))/2*49=4/98-sqrt(16-196c)/98
sqrt(16-196c)/98=y, при y>0
4/98+y=3z 2/49+y=3z
(4/98-y=z)*3 6/49-3y=3z
2/49+y=6/49-3y
4y=4/49
y=1/49
(sqrt(16-196c)/98=1/49)*98
sqrt(16-196c)^2=2^2
16-196c=4
196c=12
c=16 1/3
ответ: 16 1/3.
Объяснение:
49х^2-4х+с=0
a=49, b=-4, c=?
D=(-4)^2-4*49*c=16-196c
x1=(-(-4)+sqrt(D))/2*49=4/98+sqrt(16-196c)/98
x2=(-(-4)-sqrt(D))/2*49=4/98-sqrt(16-196c)/98
sqrt(16-196c)/98=y, при y>0
4/98+y=3z 2/49+y=3z
(4/98-y=z)*3 6/49-3y=3z
2/49+y=6/49-3y
4y=4/49
y=1/49
(sqrt(16-196c)/98=1/49)*98
sqrt(16-196c)^2=2^2
16-196c=4
196c=12
c=16 1/3