Question

Graph this function: f(x) = x2 - 4x - 5

Step 1: Identify a and b.
a=
b =

Answer 1

Answer: a= 1 b= -4

Step 2 find the vertex formula x = -b/2aX= 4/2(1)X= 2

Find the y-coordinate of the vertex: f(x)= 2^2-4(2)-53F(2)= -9

Step 3: plot the vertex(2,-9)

Step 4: factor the function to find the x- intercepts

X-intercepts are: (5,0) and (-1,0)

Step 5: plot x-interceptsStep

6: find y-interceptF(0)= -5

Step 7: plot -5

Done :)

Explanation:

Answer 2

a=1

b=-4

The graph is a parabola with vertex in (2,-9), y-intercept (0,-5) and x-intercepts (+5,0) and (-1, 0)

Explanation:

`xv = ( - b)/(2a)`

`yv = f(xv)`

y-intercept: P(0, c)

x-intercepts: find x1 and x2 with the quadratic formula, then P1(x1, 0) and P2(x2, 0)