Question

GIVING BRAILIEST !! Can someone help me with questions 17-28? No explanations needed if you don’t want to add them. I’m confused on this page. :( thank you !

Answer 1

17. 10

18. -17

19. 9

20. 58

21. -76

22. -42

23. 8

24. -6

25. 7

26. -2

27. 2

28. -4

Explanation:

for no.17-22, just substitute x with the number provided

17.

f(x) = 5x - 20

f(6) = 5(6) - 20

= 10

18.

g(x) = x² + 5x - 11

g(-3) = (-3)² + 5(-3) - 11

= -17

19.

h(x) = |2x + 7|

h(-8) = |2(-8) + 7|

= 9

20.

g(7) - 15 = 7² + 5(7) - 11 - 15

= 58

21.

-4·h(-13) = -4·|2(-13) + 7|

= -76

22.

f(-1) + g(-2) = 5(-1) - 20 + (-2)² + 5(-2) - 11

= -42

23.

f(x) = 5 - 3x

-19 = 5 - 3x

3x = 5 + 19

x = 24 ÷ 3

= 8

24.

`g(x)=(5)/(2) x-1`

`-16=(5)/(2) x-1`

`(5)/(2) x=-16+1`

`x=-15/(5)/(2)`

`=-15*(2)/(5)`

`=-6`

For no.25-28, just find the coordinate from the graph:

25.

find f(-6) means: what is the y if x=-6

f(-6) = 7

26.

find f(0) means: what is the y if x=0

f(0) = -2

27.

If f(x) = -5, what is x means: what is x if y = -5

x = 2

28.

If f(x) = 4, what is x means: what is x if y = 4

x = -4