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3 years ago

The steps below show the incomplete solution to find the value of y for the equation 6y − 3y − 5 = −3 + 23:

Mathematics

2 answers:

lorasvet [3.4K]3 years ago

6 0

Answer with Step-by-step explanation:

We have to find the value of y for the equation:

6y − 3y − 5 = −3 + 23:

Step 1: 6y − 3y − 5 = −3 + 23

Solving the right hand side of the equation gives Step 2

Step 2: 6y − 3y − 5 = 20

combining the terms of y on left hand side gives step 3

Step 3: 3y − 5 = 20

Now, Adding 5 on both sides, we get

3y-5+5=20+5

⇒ 3y=25

Hence, most likely the next step is:

3y=25

jeka943 years ago

4 0

3y=25

final answer y=25/3

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3 years ago

Determine all prime numbers a, b and c for which the expression a ^ 2 + b ^ 2 + c ^ 2 - 1 is a perfect square .

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Answer:

The family of all prime numbers such that $a^{2} + b^{2} + c^{2} -1$ is a perfect square is represented by the following solution:

$a$ is an arbitrary prime number. (1)

$b = \sqrt{1 + 2\cdot a \cdot c}$ (2)

$c$ is another arbitrary prime number. (3)

Step-by-step explanation:

From Algebra we know that a second order polynomial is a perfect square if and only if $(x+y)^{2} = x^{2} + 2\cdot x\cdot y + y^{2}$ . From statement, we must fulfill the following identity:

$a^{2} + b^{2} + c^{2} - 1 = x^{2} + 2\cdot x\cdot y + y^{2}$

By Associative and Commutative properties, we can reorganize the expression as follows:

$a^{2} + (b^{2}-1) + c^{2} = x^{2} + 2\cdot x \cdot y + y^{2}$ (1)

Then, we have the following system of equations:

$x = a$ (2)

$(b^{2}-1) = 2\cdot x\cdot y$ (3)

$y = c$ (4)

By (2) and (4) in (3), we have the following expression:

$(b^{2} - 1) = 2\cdot a \cdot c$

$b^{2} = 1 + 2\cdot a \cdot c$

$b = \sqrt{1 + 2\cdot a\cdot c}$

From Number Theory, we remember that a number is prime if and only if is divisible both by 1 and by itself. Then, $a, b, c > 1$ . If $a$ , $b$ and $c$ are prime numbers, then $2\cdot a\cdot c$ must be an even composite number, which means that $a$ and $c$ can be either both odd numbers or a even number and a odd number. In the family of prime numbers, the only even number is 2.