Determine the coordinates of the vertex of the function f = 2x^2-5x+3.

3 Answers | Add Yours

hala718's profile pic

hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted on

f(x) = 2x^2 - 5x + 3

F(x) is a parabola where:

a= 2    b= -5    c=3

The coordinates of th vertex is:

(x, y) such that:

x= -b/2a   = 5/4

y= (4ac-b^2)/4a  = (4*2*3 - 25)/4 = -1/8

Ot to find y, we could substitute with x value:

f(5/4) = -1/8

Then the coordinates is:

(5/4, -1/8)

Top Answer

giorgiana1976's profile pic

giorgiana1976 | College Teacher | (Level 3) Valedictorian

Posted on

To determine the coordinates of the vertex  of  the parable, we'll use the formula:

V (-b/2a ; -delta/4a)

We'll identify the coordinates a,b,c, of the expression of the function:

a = 2 , b = -5 , c = 3

Now, we'll calculate xV:

xV = 5/4

yV = -delta/4a

yV = (4ac-b^2)/4a

yV = (24-25)/8

yV = -1/8

The coordinates of the vertex are V(5/4 , -1/8).

neela's profile pic

neela | High School Teacher | (Level 3) Valedictorian

Posted on

f(x) = y = 2x^2-5x+3. to find the vertex.

Solution:

y = 2x^2-5x+3

y/2 = x^2 -5x/2+3/2

y/2 = (x-5/4)^2 - (5/4)^2+3

y/2 = (x-5/4)^2  + (-25+48)/1= (x-5/4)^2 + (23/16)

y/2 -23/16) = (x-5/4)^2

(1/2) (y-23/8) = (x-5/4)^2. If we compare this parabola with the standard parabola  4aY =  X^2 with vertex X = 0 and Y = 0, we get

x-5/4 = 0 and y-23/8 = 0 gives the coordinates of the given parabola.

So x= 5/4 and y = 23/8 are the coordinates of the vertex.

We’ve answered 318,947 questions. We can answer yours, too.

Ask a question