Advanced Math practice question

Answer: A. x = 3

The x-intercepts are 1 and 5 (since x² − 6x + 5 = (x − 1)(x − 5)); the axis is midway, x = 3. (Also −b/2a = 6/2 = 3.)

Why the other answers are wrong

B. x = 1

x = 1 is one intercept, not the midpoint.

C. x = 5

x = 5 is the other intercept.

D. x = −3

x = −3 has the wrong sign; −b/2a = −(−6)/2 = 3.

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