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2 years ago

Which of these is not a Pythagorean triple

Mathematics

1 answer:

andreyandreev [35.5K]2 years ago

3 0

Answer:

A. 1,2,3

Step-by-step explanation:

The only Pythagorean triple that is an arithmetic sequence is 3, 4, 5 and its multiples.

The triple 1, 2, 3 is not a Pythagorean triple. (It doesn't even form a triangle.)

_____

If you don't recognize the offered choices as being among the Pythagorean triples you have memorized, you can always check to see if ...

a² +b² = c²

1² +2² = 1 +4 = 5 ≠ 3² . . . . . (1, 2, 3) is not a Pythagorean triple

3² +4² = 9 +16 = 25 = 5²

5² +12² = 25 +144 = 169 = 13²

7² +24² = 49 +576 = 625 = 25²

A couple of other triples commonly seen are ...

(8, 15, 17), (9, 40, 41)

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Y = -4x - 5 y = 3x - 2 Is (3, 7) a solution of the system? Will give brainliest!

Evgesh-ka [11]

Answer:

x=-3/7 and y=_23/7

Step-by-step explanation:

y=-4x-5 and y=3x-2

using comparison method

-4x-5=3x-2

-4x-3x=-2+5

-7x=3

x=3/-7

substituting the value of x

y=3x-2

=3×(-3/7)-2

=-9/7-2

=-9-14/7

=-23/7

6 0

3 years ago

HELP FAST PLEASE!!!!!

lidiya [134]

Alright, lets get started.

The answer Sandra got is correct that is zero but there are some mistakes she made while writing steps.

$2 cot(\frac{-9\pi}{2}) = 2 cot(\frac{9\pi}{2})$ Incorrect step

Because as per even/odd identity,

Cot (-Θ) = - cot (Θ)

Hence

$2 cot (\frac{-9\pi}{2}) = - 2 cot (\frac{9\pi}{2})$

Now,

It could be written as

$-2 cot (\frac{9\pi}{2}) = -2 cot (\frac{\pi}{2})$

$-2 * 0$

Hence the answer is 0. : Answer

Hope it will help :)

3 0

3 years ago

What is the value for the missing angle ??

allsm [11]

Answer: 9 inches.
Do the pythagorean theorem to find your answer.
Formula: a^2 + b^2 = c2
12 = b
15 = c
a^2 + 12^2 = 15^2
Simplify the equation
a^2 + 144 = 225
Subtract 144 on both sides.
a^2 = 81
Square root of 81 is 9.

8 0

3 years ago

If x+1/x=7,find x^2+1/x^2

trapecia [35]

Answer:

x²+1/x² = 51

Explanation:

Given x - 1/x = 7 ---(1)

We know the algebraic identity:

a²+b²-2ab = (a-b)²

a²+b² = (a-b)²+2ab

Now,

x²+1/x²

= (x-1/x)²+2*x*(1/x)

= (x-1/x)²+2

:7²+2 [ from (1)] =

= 49+2

= 51

Therefore,

x²+1/x² = 51

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3 years ago

Write the standard form of the equation of each line. 1. y= -2/5x+1 2. y+3 = -3/2(x+1)

gavmur [86]

Answer:

1. 2x + 5y = 5

2. 3x + 2y = -9

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

Which of these is not a Pythagorean triple￼

Which of these is not a Pythagorean triple