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In part [tex]$E$[/tex], you proved that any Pythagorean triple can be generated using the identity [tex]$\left(x^2-y^2\right)^2+(2 x y)^2=\left(x^2+y^2\right)^2$[/tex]. Find the missing [tex]$x$[/tex]- and [tex]$y$[/tex]-values and Pythagorean triples using the identity given.

Write the triple in parentheses, without spaces between the values, with a comma between values, and in order from least to greatest.

\begin{tabular}{|c|c|c|}
\hline
[tex]$x$[/tex]-value & [tex]$y$[/tex]-value & Pythagorean Triple \\
\hline
4 & 3 & [tex]$(7,24,25)$[/tex] \\
\hline
5 & 4 & [tex]$(9,40,41)$[/tex] \\
\hline
6 & 3 & [tex]$(27,36,45)$[/tex] \\
\hline
7 & 5 & [tex]$(24,70,74)$[/tex] \\
\hline
\end{tabular}


Sagot :

To generate Pythagorean triples using the identity [tex]\( (x^2-y^2)^2 + (2xy)^2 = (x^2+y^2)^2 \)[/tex], let's calculate the triples step-by-step for each given pair of [tex]\( x \)[/tex] and [tex]\( y \)[/tex] values and find the missing values.

1. For [tex]\( x = 4 \)[/tex] and [tex]\( y = 3 \)[/tex]:
[tex]\[ a = x^2 - y^2 = 4^2 - 3^2 = 16 - 9 = 7 \][/tex]
[tex]\[ b = 2xy = 2 \cdot 4 \cdot 3 = 24 \][/tex]
[tex]\[ c = x^2 + y^2 = 4^2 + 3^2 = 16 + 9 = 25 \][/tex]
The Pythagorean triple is [tex]\( (7, 24, 25) \)[/tex].

2. For [tex]\( x = 5 \)[/tex] and the unknown [tex]\( y \)[/tex], we already know the Pythagorean triple is [tex]\( (9, 40, 41) \)[/tex]:
[tex]\[ c = 41 \][/tex]
Since [tex]\( c = x^2 + y^2 \)[/tex]:
[tex]\[ 41 = 5^2 + y^2 = 25 + y^2 \implies y^2 = 41 - 25 = 16 \implies y = 4 \][/tex]
The Pythagorean triple remains [tex]\( (9, 40, 41) \)[/tex].

3. For [tex]\( y = 3 \)[/tex] and the unknown [tex]\( x \)[/tex], we have the Pythagorean triple [tex]\( (27, 36, 45) \)[/tex] already provided:
[tex]\[ c = 45 \][/tex]
Since [tex]\( c = x^2 + y^2 \)[/tex]:
[tex]\[ 45 = x^2 + 3^2 = x^2 + 9 \implies x^2 = 45 - 9 = 36 \implies x = 6 \][/tex]
The Pythagorean triple remains [tex]\( (27, 36, 45) \)[/tex].

4. For [tex]\( x = 7 \)[/tex] and [tex]\( y = 5 \)[/tex]:
[tex]\[ a = x^2 - y^2 = 7^2 - 5^2 = 49 - 25 = 24 \][/tex]
[tex]\[ b = 2xy = 2 \cdot 7 \cdot 5 = 70 \][/tex]
[tex]\[ c = x^2 + y^2 = 7^2 + 5^2 = 49 + 25 = 74 \][/tex]
The Pythagorean triple is [tex]\( (24, 70, 74) \)[/tex].

Thus, filling out the table:

[tex]\[ \begin{tabular}{|c|c|c|} \hline $x$-value & $y$-value & Pythagorean Triple \\ \hline 4 & 3 & (7,24,25) \\ \hline 5 & 4 & (9,40,41) \\ \hline 6 & 3 & (27,36,45) \\ \hline 7 & 5 & (24,70,74) \\ \hline \end{tabular} \][/tex]