Question

Could someone explain/answer these?

Answer 1

When it asks for the value of f(?) or g(?), you plug whatever number is in the parentheses into the “x” of the equation that contains f or g. Hope this helped

Answer 2

1)

f(x) = x² + 9 g(x) = 24 + 4x

f(4) = (4)² + 9 g(-1) = 24 + 4(-1)

= 16 + 9 = 24 - 4

= 25 = 20

`(f(4))/(g(-1)) = (25)/(20) = (125)/(100) = 1.25`

****************************************************************

g(x) = 2ˣ - 4 f(x) = 4x² - 5x - 5

g(6) = 2⁶ - 4 f(-5) = 4(-5)² - 5(-5) - 5

= 64 - 4 = 100 + 25 - 5

= 60 = 120

`(g(6))/(f(-5)) = (60)/(120) = (1)/(2) = 0.5`

***************************************************************

f(x) = (3x + 7)²

f(1) = (3(1) + 7)²

= (3 + 7)²

= (10)²

= 100

****************************************************************

3xy + 2x² - y³ ; when x = 6 and y = -2

3(6)(-2) + 2(6)² - (-2)³

-36 + 72 - (-8)

36 + 8

44