Question

Hello I’m doing error analysis and I’m having some trouble with questions 3 and 4. Thank you!

Answer 1

Step-by-step explanation:

f(x) = 3x² + 4x

f(g) = √( x + 7)

1)

If x = -5, f(-5) = 3(-5)² + 4(-5)

3(25) + 4(-5)

75-20

55

Not sure how they get 95 though. I think they forgot it was a negative instead of a positive.

2)

If x = -3, f(-3) = 3(-3)² + 4 (-3)  

3(9) - 12

27 - 12

15

3)

If x = 9, g(9) = √(9 + 7)

√(16) = 4

4) If g(x) = 0, then

0 = √(x + 7)

0 = x + 7

x = -7