What is this answer?

Question

Use synthetic division to find the function value.​ Then, check your work using a graphing calculator.

​f(x)=x4−x3−18x2+39x−23​; find f(5):

Answer 1

The remainder using synthetic division is the same as the value of the function of the divisor

x⁴-x³-18x²+39x-23

1 -1 -18 39 -23 |5

5 20 10 245

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1 4 2 49 222 <--- remainder = f(5)

f(5) = 222

To check graphically, using Desmos, plot f(x) and x=5

The intersection point will be (5,222)

or just enter f(5) after graphing f(x)