Question

What is the y-intercept of the quadratic function
f(x) = (x – 8)(x + 3)?

(8,0)
(0,3)
(0,–24)
(–5,0)

Answer 1

f(x) =(x-8) (x+3)
Now we can write
y=(x-8) (x+3)

At the y intercept , x=0
Put x=0
y=(0-8) (0+3)
y=(-8) (3)
y= -24

The y intercept is -24

and the point where the curve cuts the, Y-axis axis is (0, -24)

Answer 2

Given :  f(x) = (x – 8)(x + 3)

To find : y-intercept of the quadratic function

(8,0)

(0,3)

(0,–24)

(–5,0)

Solution:

f(x) = (x – 8)(x + 3)

y intercept where function cut y axis

hence x = 0

f(0) is y intercept

f(0) = (0 - 8)(0 + 3)  

=(-8)(3)

= - 24

y intercept is  (0 , - 24)

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