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# Is 4a2-21a plus 5 prime

Updated: 4/28/2022

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10y ago

No.

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10y ago

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Q: Is 4a2-21a plus 5 prime
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(r + 1)(2r + 5)

### Is 2 x 3 x 5 x 7 plus 5 a prime number?

that would be 215, so no. it is divisible by 5, so that means it is not prime.

n = 5.

### Can even numbers from 4-100 equal a prime plus a prime?

Yes for example 5+11 = 16

### Is it true that adding any two prime numbers results in a unique number for example 3 plus 7 equals 10 and no other prime numbers can be added together to get 10?

But 5+5 = 10 and 5 is a prime number

### What is the counterexample of the sum of 2 different prime numbers is even?

2 + 3 = 5 Two plus any odd prime number is odd.

### 2 times 3 times 5 plus 1 is what prime number?

2 x 3 x 5 + 1 = 31

### What is prime plus prime?

A prime plus another prime is at the very least going to be an even number since all primes (with the exception of 2) are odd.

### Is the value of prime or composite if 3a plus 6b prime or composite when a equals 1 and b equals 5?

It would be composite because a=1 and b=5 so it would be 3+1+6+5=15, and 15 can be divided by 3 into 5.

### Is 9x2 plus 48xy plus 64y2 prime?

9x2 + 48xy + 64y2 = (3x + 8y)2. Since it is a squared number cannot be a prime. We can say that as a perfect square number, it is formed by the sum of 1 and some prime numbers (excluded 2), i.e 1 + 3 + 5 + 7 + 11 + ... n, where n is a prime.

### Factor the polynomial. If it is prime type PRIME. x2 plus 5x plus 4?

It is: (x+1)(x+4) none of which are prime numbers

### What are the prime numbers between 3 and 20?

5, 7, 11, 13, 17, and 19; plus 3 if you are including it.