Question

How many solutions are there to the equation x2 - 7 = 0?

A) 1
B) 2
C) 4
D) 7
E) 14

Answer 1

Use the discriminant (b^2-4ac)

a=1, b=0, c=-7
0^2-4(1)(-7)
0-4(-7)
0+28
28

Since 28>1, there are 2 solutions.
Final answer: B