Simplify:
5x2 – x + 9 = [?]
x=3
Enter

The answer is 51

Step-by-step explanation:

What you need to do here is assign a value of 3 to x, and output the value.  Let's see what we get:

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

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