Is 19 a prime number or composite?

Mathematics

2 answers:

Andrew [12]3 years ago

7 0

Answer:

19 is a prime number.

Step-by-step explanation:

"When a number has more than two factors it is called a composite number. Here are the first few prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, etc."

Alexandra [31]3 years ago

5 0

Prime, because the only number that can go into it are 19 and 1

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What method(s) would you choose to solve the equation: x2 + 2x - 6 = 0

Nataly_w [17]

Complete the square since can't factor
2/2=1
add 1 to both sides
x²+2x+1-6=1
factor perfect square
(x+1)²-6=1
add 6 to both sides
(x+1)²=7
sqrt both sides
x+1=+/-√7
minus 1 both sides
x=-1+/-√7

so x=-1+√7 or x=-1-√7

7 0

3 years ago

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Can anyone help me with this?

-Dominant- [34]

Answer:

Step-by-step explanation:

you need to divide by 2. And you need to simplify a fraction.