EDGE Math 8

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Result

Choose the correct answer to each question.

1.	If $f (x) = x^{2} - 5$ and $g (x) = x + 4,$ what is the value of $(f \circ g) (- 2) ?$

−2

−1

1

3

Answer: −1

2.	If $f (x) = x^{2} - 5$ and $g (x) = x + 4,$ what is $g (f (x)) ?$

x^{2} - 1

x^{2} + 15

x^{2} + x - 9

x^{2} + 8 x - 11

Answer: $x^{2} - 1$

3.	In a linear function, the y-intercept is 3. For every 2-unit increase in x, there is an 8-unit decrease in y. What is the equation of the linear function?

y = 2 x + 3

y = - 4 x + 3

y = - 2 x + 3

y = - \frac{1}{2} x + 3

Answer: $y = - 4 x + 3$

4.	What is the x-intercept of the linear equation $2 x + 3 y = 8 ?$

−8

−4

4

8

Answer: 4

5.	What is the trend of the line $y = - 2 x + 5 ?$

constant

increasing

decreasing

cannot be determined

Answer: decreasing

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