The equation f(x) = 5x2 − 30x + 6 represents a parabola. What is the vertex of the parabola?

(−5, 281)
(5, −19)
(−3, 141)
(3, −39)

Question

The equation f(x) = 5x2 − 30x + 6 represents a parabola. What is the vertex of the parabola?

 (−5, 281)
 (5, −19)
 (−3, 141)
 (3, −39)

triciaal · Answer

standard  ax^2 +bx + c
vertex a(x-h)^2 + k

nnesha · Answer

$$\huge\rm \frac{ -b }{ 2a }$$ use this formula to find x-coordinate of the vertex
 then substitute all x's for its value into f(x) equation  to find y-coordinate of the vertex

triciaal · Answer

vertex (h, k)

anonymous · Answer

what would i input into the formula?

nnesha · Answer

$$\huge\rm Ax^2+Bx+C$$
quadratic equation 
where 
a=leading coefficient 
b=middle term
c=constant term

luigi0210 · Answer

There are two ways to find the vertex.. and since your equation is already in standard form, using $\large \frac{-b}{2a} $ would be easier.

unless you want to complete the square and use @triciaal 's way

anonymous · Answer

Oh, okay. Thank you, I will give you an update on how I do :D

anonymous · Answer

Well, Look at the formula, ax^2 How many x^2 numbers do you have in your equation? bx
How many numbers do you have that have x? and c, your only remaing number.