+0

# The function f(x) is the height of an object x seconds after it is thrown in the air. The object reaches its maximum height in 2 s, and hits

0
48
1
+345

The function f(x) is the height of an object x seconds after it is thrown in the air. The object reaches its maximum height in 2 s, and hits the ground at 5 s.

What is the practical domain for the function?

whole numbers

all real numbers

[0,5]

(0,5)

What is (f+g)(x)?

f(x) = 8x2+16x+6

g(x)=x3−3x2−9

x3+5x2+16x+3

x3+8x2+16x−3

x3+5x2+16x−3

2x3+5x2+16x−3

What is (f⋅g)(x)

f(x)=x4−9

g(x)=x3+9

x7+9x4+9x3+81

x7+9x4−9x3−81

x7−9x4−9x3−81

x7−9x4+9x3+81

jbouyer  Feb 14, 2018
Sort:

#1
+82916
+1

[0,5]

What is (f+g)(x)?

f(x) = 8x^2+16x+6

g(x)=x^3−3x^2−9

f +  g  =       8x^2 + 16x  + 6   + x^3 - 3x^2 - 9   =   x^3 + 5x^2  + 16x - 3

What is (f⋅g)(x)

f(x)=x^4−9

g(x)=x^3+9

f * g   =

(x^4 - 9( (x^3 + 9)     use the distributive property

x^4 (x^3) + x^4(9)  + (-9)(x^3)  + (-9)(9)

x^7  + 9x^4   -  9x^3  - 81

CPhill  Feb 14, 2018

### 14 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