2. Consider the functions f(x) = 8x – 10 and g(x) = 2x – 7.
What is the zero of function g?
A 3.5
B -7
C 2
D -3.5

1 Subtract 8x8x from both sides.

fx-8x=-10fx−8x=−10

2 Factor out the common term xx.

x(f-8)=-10x(f−8)=−10

3 Divide both sides by f-8f−8.

x=-\frac{10}{f-8}x=−

f−8

10

1 Subtract 2x2x from both sides.

gx-2x=-7gx−2x=−7

2 Factor out the common term xx.

x(g-2)=-7x(g−2)=−7

3 Divide both sides by g-2g−2.

x=-\frac{7}{g-2}x=−

g−2

7

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer