Zero
"minus zero" is the same as plus zero in that it makes no difference to the sum. So the answer is -3.
It is equal to zero.
Variance is standard deviation squared. If standard deviation can be zero then the variance can obviously be zero because zero squared is still zero. The standard deviation is equal to the sum of the squares of each data point in your data set minus the mean, all that over n. The idea is that if all of your data points are the same then the mean will be the same as every data point. If the mean is the equal to every data point then the square of each point minus the mean would be zero. All of the squared values added up would still be zero. And zero divided by n is still zero. In this case the standard deviation would be zero. Short story short: if all of the points in a data set are equal than the variance will be zero. Yes the variance can be zero.
It equals 0. Zero times zero equals zero.
It can't be solved because the discriminant of this quadratic equation is less than zero
x = 1
Without knowing what "x" is, we cannot say what the answer will be. And without knowing the answer, we cannot solve for "x". Set x at zero, for example. Zero squared is zero, plus 6 time zero which is zero, minus 55. Your answer is then -55. Set x at one, for example. One squared is one, plus 6 times 1 which is six, minus 55. Your answer is then -48. Etc.
Zero
(x-2)(x-4) = 0 x = 2 or x = 4
X=1
"minus zero" is the same as plus zero in that it makes no difference to the sum. So the answer is -3.
zero
Zero minus zero equals zero.
It can't be factored because its discriminant is less than zero.
x = 5 / 6squared + 7
Yes because its discriminant is equal to zero