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The diagram represents the factorization of [tex]$x^2 - 9x + 18$[/tex]. It is partially completed.
\begin{tabular}{|c|c|c|}
\cline {2-3} \multicolumn{1}{c|}{} & [tex]$x$[/tex] & -3 \\
\hline [tex]$x$[/tex] & [tex]$x^2$[/tex] & [tex]$?$[/tex] \\
\hline -6 & [tex]$?$[/tex] & 18 \\
\hline
\end{tabular}

Which two terms are missing from the diagram?

A. [tex]$-x$[/tex] and [tex]$-8x$[/tex]

B. [tex]$-2x$[/tex] and [tex]$-7x$[/tex]

C. [tex]$-3x$[/tex] and [tex]$-6x$[/tex]

D. [tex]$-4x$[/tex] and [tex]$-5x$[/tex]


Sagot :

To solve the problem, we need to find the missing terms in the factorization of the quadratic equation [tex]\(x^2 - 9x + 18\)[/tex].

First, let's look at the quadratic equation [tex]\(x^2 - 9x + 18\)[/tex] and factor it. We aim to rewrite it as a product of two binomials in the form:
[tex]\[ (x - a)(x - b) \][/tex]

The quadratic equation expands to:
[tex]\[ x^2 - (a+b)x + ab \][/tex]

By comparing this with the given quadratic equation [tex]\(x^2 - 9x + 18\)[/tex], we can identify:
[tex]\[ a + b = 9 \quad \text{and} \quad ab = 18 \][/tex]

We need to find two numbers, [tex]\(a\)[/tex] and [tex]\(b\)[/tex], that add up to 9 and multiply to 18.

Considering the pairs of factors of 18, we have:
[tex]\[ (1, 18), (2, 9), (3, 6), (6, 3), (9, 2), (18, 1) \][/tex]

From these pairs, only [tex]\((3, 6)\)[/tex] and [tex]\((6, 3)\)[/tex] add up to 9. Therefore, the factorization of the quadratic equation is:
[tex]\[ x^2 - 9x + 18 = (x - 3)(x - 6) \][/tex]

Next, we use this factorization to fill in the given table:
[tex]\[ \begin{array}{|c|c|c|} \cline { 2 - 3 } \multicolumn{1}{c|}{} & x & -3 \\ \hline x & x^2 & ? \\ \hline -6 & ? & 18 \\ \hline \end{array} \][/tex]

We fill in the multiplication results for each cell:
1. The top right cell: [tex]\((-3) \times x = -3x\)[/tex]
2. The bottom left cell: [tex]\((-6) \times x = -6x\)[/tex]

The completed table should look like this:
[tex]\[ \begin{array}{|c|c|c|} \cline { 2 - 3 } \multicolumn{1}{c|}{} & x & -3 \\ \hline x & x^2 & -3x \\ \hline -6 & -6x & 18 \\ \hline \end{array} \][/tex]

The missing terms are [tex]\(-3x\)[/tex] (top right cell) and [tex]\(-6x\)[/tex] (bottom left cell).

So the missing terms from the diagram are:
[tex]\[ -3x \quad \text{and} \quad -6x \][/tex]

Thus, the correct answer is:
[tex]\[ \boxed{-3x \text{ and } -6x} \][/tex]