How Do You Use Synthetic Substitution To Evaluate P X 4x 2 9x 2 For X 3

Answer is 11, You use the L shaped box (read below)

So first step is to create that L shaped box and write 3 outside of it.

The first number is the coefficient of the greatest power, or 4, since it’s with ##x^2##. Go in order, the next number should be the coefficient of x, and the next after that is ##x^0=1##.

Pull the first number down without doing anything to it, then multiply that by the number outside the Lso ##4 * 3 = 12##take that answer and put it back in under the second coefficient and add them together-9 + 12 = 3

then take that answer, multiply by the number outside the box##3 * 3 = 9##and put that under the third coefficient and add them together2+9=11

Plug x=3 into the equation to check.

Prof. Angela


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