Select all the correct answers.

Which triples are Pythagorean triples?

A. [tex](8,15,17)[/tex]
B. [tex](1, \sqrt{3}, 2)[/tex]
C. [tex](9,12,16)[/tex]
D. [tex](8,11,14)[/tex]
E. [tex](20,21,29)[/tex]
F. [tex](30,40,50)[/tex]



Answer :

To determine which of the given triples are Pythagorean triples, we must check if each set of numbers satisfies the Pythagorean theorem. According to the Pythagorean theorem, for a triple [tex]\((a, b, c)\)[/tex] to be a Pythagorean triple, the sum of the squares of [tex]\(a\)[/tex] and [tex]\(b\)[/tex] must equal the square of [tex]\(c\)[/tex]. In other words, [tex]\(a^2 + b^2 = c^2\)[/tex].

Let's examine each triple one by one:

1. Triple [tex]\((8, 15, 17)\)[/tex]:
[tex]\[ 8^2 + 15^2 = 64 + 225 = 289 \][/tex]
[tex]\[ 17^2 = 289 \][/tex]
Since [tex]\(8^2 + 15^2 = 17^2\)[/tex], [tex]\((8, 15, 17)\)[/tex] is a Pythagorean triple.

2. Triple [tex]\((1, \sqrt{3}, 2)\)[/tex]:
[tex]\[ 1^2 + (\sqrt{3})^2 = 1 + 3 = 4 \][/tex]
[tex]\[ 2^2 = 4 \][/tex]
Since [tex]\(1^2 + (\sqrt{3})^2 = 2^2\)[/tex], [tex]\((1, \sqrt{3}, 2)\)[/tex] is not a Pythagorean triple.

3. Triple [tex]\((9, 12, 16)\)[/tex]:
[tex]\[ 9^2 + 12^2 = 81 + 144 = 225 \][/tex]
[tex]\[ 16^2 = 256 \][/tex]
Since [tex]\(9^2 + 12^2\)[/tex] does not equal [tex]\(16^2\)[/tex], [tex]\((9, 12, 16)\)[/tex] is not a Pythagorean triple.

4. Triple [tex]\((8, 11, 14)\)[/tex]:
[tex]\[ 8^2 + 11^2 = 64 + 121 = 185 \][/tex]
[tex]\[ 14^2 = 196 \][/tex]
Since [tex]\(8^2 + 11^2\)[/tex] does not equal [tex]\(14^2\)[/tex], [tex]\((8, 11, 14)\)[/tex] is not a Pythagorean triple.

5. Triple [tex]\((20, 21, 29)\)[/tex]:
[tex]\[ 20^2 + 21^2 = 400 + 441 = 841 \][/tex]
[tex]\[ 29^2 = 841 \][/tex]
Since [tex]\(20^2 + 21^2 = 29^2\)[/tex], [tex]\((20, 21, 29)\)[/tex] is a Pythagorean triple.

6. Triple [tex]\((30, 40, 50)\)[/tex]:
[tex]\[ 30^2 + 40^2 = 900 + 1600 = 2500 \][/tex]
[tex]\[ 50^2 = 2500 \][/tex]
Since [tex]\(30^2 + 40^2 = 50^2\)[/tex], [tex]\((30, 40, 50)\)[/tex] is a Pythagorean triple.

Thus, the triples that are Pythagorean triples are:
- [tex]\((8, 15, 17)\)[/tex]
- [tex]\((20, 21, 29)\)[/tex]
- [tex]\((30, 40, 50)\)[/tex]