33
14x2-7x2-16 7x2-16 (this can't be simplified any more)
It is undefined. Division by zero is not defined: it is not an operation that has any meaning. Consequently, an expression containing "divided by zero" is not valid.
-3
x + 1
Actually, x2 - 12 cannot be simplified.
The answer is: X1 = 2 X2 = -7
None of the graphs that I can see!
x-7
x-8
x - 3
7x + 8
4x + 20