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20 July, 06:32

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

A) 1

B) 2

C) 4

D) 7

E) 14

+4
Answers (1)
  1. 20 July, 07:25
    0
    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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