Question

Use synthetic substitution to evaluate the polynomial for the given value.

P(x) = x3 + 2x2 − 5x + 6 for x = −9

Answer 1

\(\large {P(x) = 1x^3 + 2x^2 - 5x + 6 \div x = -9\\
\begin{array}{rrrrrrrrl}
-9&|&1&2&-5&6\\
&|&&-9&?
\\\hline\\
&|&1&-7
\end{array}}\)

notice...all you do is, "drop" the first coefficient, and multiply times the divisor
and put the result below the next term, and add them up

and so on

Answer 2

so x=7? @jdoe0001

Answer 3

@jdoe0001