Hellp!
the function f(x) varies directly with x and f(x)=160 when x=40. what is f(x) when x=8 a)32 b)20 c) 5 d)2

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square