08-09-2017
Mathematics

contestada

How many solutions are there to the equation x2 - 7 = 0?
A) 1
B) 2
C) 4
D) 7
E) 14

Respuesta :

kphung76127 kphung76127

08-09-2017

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

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