For all your questions, big or small, IDNLearn.com has the answers you need. Get the information you need from our experts, who provide reliable and detailed answers to all your questions.

Question 2 of 8
What is the missing number in the synthetic division problem below?

\begin{tabular}{rrrc}
\hline
2 & -2 & 3 & 4 \\
& 4 & 4 & 14 \\
\hline
2 & 2 & [tex]$?$[/tex] & 18 \\
\end{tabular}

A. 4
B. -1
C. 2
D. 7


Sagot :

Sure, let's walk through the steps to find the missing number in the synthetic division problem.

We start with the initial row of coefficients and the divisor used for synthetic division:
[tex]\[ \begin{array}{cccc} 2 & -2 & 3 & 4 \\ & 4 & 4 & 14 \\ \hline \end{array} \][/tex]

The first number of the bottom row is directly taken from the first number of the top row:
[tex]\[ \begin{array}{cccc} 2 & -2 & 3 & 4 \\ & 4 & 4 & 14 \\ \hline 2 & & & \\ \end{array} \][/tex]

Next, multiply the 2 (from the bottom row) by the divisor (4) and write the result (8) below -2:
[tex]\[ \begin{array}{cccc} 2 & -2 & 3 & 4 \\ & 4 & 8 & 14 \\ \hline 2 & & & \\ \end{array} \][/tex]

Add the numbers in the second column:
[tex]\[ \begin{array}{cccc} 2 & -2 & 3 & 4 \\ & 4 & 8 & 14 \\ \hline 2 & 2 & & \\ \end{array} \][/tex]

Next, multiply the new value (2) by the divisor (4) and write the result (8) below 3:
[tex]\[ \begin{array}{cccc} 2 & -2 & 3 & 4 \\ & 4 & 8 & 8 \\ \hline 2 & 2 & & \\ \end{array} \][/tex]

Add the numbers in the third column:
[tex]\[ \begin{array}{cccc} 2 & -2 & 3 & 4 \\ & 4 & 8 & 8 \\ \hline 2 & 2 & 11 & \\ \end{array} \][/tex]

Now, compare the expected fourth term from the synthetic division setup [tex]\(4\)[/tex] added with [tex]\(14\)[/tex] :
[tex]\[ 3 + 4 = 7 \][/tex]

Thus, the missing number required to keep the synthetic division consistent is:

[tex]\[ 11 - 4 = 7 \][/tex]

So the correctly filled in row should be:
[tex]\[ \begin{array}{cccc} 2 & -2 & 3 & 4 \\ & 4 & 4 & 14 \\ \hline 2 & 2 & 7 & 18 \\ \end{array} \][/tex]

Thus the missing number is [tex]\( \boxed{7} \)[/tex]. Answer choice D is correct.