7.6 Exit A2

A function is a relation between

• x and y

• input and output

• domain and range

• all

The domain of

 $y=\sqrt{x-1}+2$  

• R

• R - {1}

• x>=1

• none

The domain of

 $y=\sqrt{x-1}+2$  

• R

• R - {1}

• x>=1

• none

Which is true

• (f+g)(x)=f(x)+g(x)

• (f-g)(x)=f(x)-g(x)

• (fg)(x)=f(x)g(x)

• all

When f(x) = 9 - 3x and g(x) = 5x - 7

find f(x) + g(x).

• 14x - 10

• -8x + 2

• 2x + 2

• 2x - 2

Tags

CCSS.HSF-BF.A.1B

When f(x) = x² + 9 and g(x) = x - 9,

find f(x) - g(x).

• x² + x + 9

• x² - x + 9

• x² - x

• x² - x + 18

Tags

CCSS.HSF-BF.A.1B

When f(x) = x² - 9

and g(x) = x + 3 ,

find f(x) / g(x).

• x - 3

• x + 3

• x - 12

• x - 6

Tags

CCSS.HSF-BF.A.1B

f(x)=2x + 4

g(x)=3x² - 1

Find f(x) ⋅ g(x)

• 6x⁴ + 12x³ - 4x² - 8x

• -6x³ + 12x² + 2x - 4

• 6x³ + 12x² - 2x - 4

• 5x² - 18x + 20

Tags

CCSS.HSF-BF.A.1B

f(x) = 3x + 10

g(x) = x - 2

Find f(g(x))

• 3x + 4

• 3x - 4

• 3x + 8

• None of these.

Tags

CCSS.HSF-BF.A.1C