f(x)=-5x^2+7x+4 I need the x-coordinate of the vertex of the parabola defined by this function

Question

anonymous · Answer

what class is this for?

anonymous · Answer

you can take the derivative and set it to 0 and solve for x

anonymous · Answer

If you haven't learned derivatives, it is in your best interest to convert this to vertex form. You are currently in$$ax^2+bx+c$$ but you want it in $$a(x-h)^2+k$$ where $$(h,k)$$ is your vertex

anonymous · Answer

Welcome to openstudy by the way

directrix · Answer

The x-coordinate of the vertex of a parabola is x = -b/(2*a).

In f(x) = f(x)=-5x^2+7x+4, the a comes from the coefficient of the x^2 term and is- 5.
The b is the coefficient of the x term and is 7.

x = -b/(2*a) =    -7/(2 * -5) = ?  @klapratt72