For which discriminant is the graph possible? b2 – 4ac = 0

b2 – 4ac = 4

b2 – 4ac = –1

b^2 – 4ac = 4

Step-by-step explanation:

Since the graph crosses the axis twice, it has two real solutions.  That means the discriminant must be positive.

b^2 - 4ac>0

where's the diagrams?

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents