We can solve this equation by completing the square. Notice that

and

. Therefore, we can turn

into

. y, in this equation, only has one real solution: 4. So your answer would be (B).
Hi!
The first number line is equals to 
The second number line is equals to 
The third number line is equals to 
The fourth number line is equals to 2
The fifth number line is equals to 0
The sixth number line is 
The answer is; second, fourth and fifth number lines.
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<em>I hope, I could help.</em>
<em>Wish Good Lessons! ^-^</em>
f(3) = 1
substitute x = 3 into f(x)
f(3) = (2 × 3) - 5 = 6 - 5 = 1