a. -7/3

b. 5

c. 3/14

d. -3/7

a. -7/3

b. 5

c. 3/14

d. -3/7

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Miami, FL

the x value for the vertex of a parabola is -b/2a =-3/(-2*7) = 3/14

is the answer, the derivation made by my colleague Piyushi L is perfect as well.

Apex, NC

df(x) / dx should be 0 for the parabola f(x) at the vertex point

df(x)/dx = -14x + 3 = 0

x = 3/14

Answer is c

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