+0

# ALG II Help

0
71
2

1.

Which description is correct for the x-intercept(s) of Function A and Function B?

Function A:

x g(x)
0 −3
7 2
−2 0
1 0
4 −5

Function B: f(x)=|x|−4

• Function A has two x-intercepts.
Function B has one x-intercept.

• Both functions have the same x-intercept(s).

• Each function has one x-intercept.

• Each function has two x-intercepts.

2.

Which comparison is correct for the values of f(x) and g(x) when x=−3?

Function A: f(x)=−x2+4

Function B:

xg(x)

−5−2

−40

−31

−24

• f(−3)=g(−3)
• f(−3)>g(−3)
• f(−3)

Thanks so much for all your help!

Guest Mar 17, 2018
Sort:

#1
+12247
+2

x-intercepts occur where y= 0

Function A   has TWO  at x=-2 and x=1

Function B has TWO where x = 4 and -4

A when x = -3     -  (-3)^2 +4 = -5

B when x = -3                       =1       (given)      Whatever choice matches this...you didnt list one that does.

ElectricPavlov  Mar 17, 2018
#2
+6945
+2

1.

Function A:

 x g(x) 0 -3 7 2 -2 0 1 0 4 -5

Function B:

f(x)  =  |x| − 4

The x-intercepts of a function are the x values when that make the function equal 0.

In function A, the x-intercepts are  -2  and  1  .

In Function B, the x-intercepts are  4  and  -4 .

So each function has two x-intercepts.

2.

Function A:

f(x)  =  -x2 + 4

Function B:

 x g(x) -5 -2 -4 0 -3 1 -2 4

When  x = -3 ,  f(x)  =  f(-3)  =  -(-3)2 + 4  =  -9 + 4  =  -5

When  x = -3 ,  g(x)  =  g(-3)  =  1

-5   <  1         so...

f(-3)  <  g(-3)

hectictar  Mar 17, 2018

### 26 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details