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maw [93]
3 years ago
9

How do you know or what indicates to you that the solution set of an equation is all real numbers?

Mathematics
1 answer:
Harrizon [31]3 years ago
3 0

Answer:

  the equation is a tautology, or the system of equations is under-specified

Step-by-step explanation:

By definition, an equation that is a tautology is true for all values of the variable(s). Hence, its solution set is "all real numbers."

One such equation is ...

  x = x

__

An under-specified system of equations* may also have "all real numbers" as a solution set. For example, two equations in 3 unknowns:

  x + y = 3

  x + z = 5

The solution set is ...

  (x, y, z) = (x, 3-x, 5-x)

Every value of x will give a solution.

__

Similarly, a dependent system of equations may have "all real numbers" as a solution. A system is dependent when one or more of the equations can be derived from the others.

For example, adding the equation 2x+y+z=8 to the above set will give 3 equations in 3 unknowns. However, this added equation can be obtained by adding together the two above. It adds nothing that would restrict the solution set.

A system of two equations in two unknowns will be <em>dependent</em> if one of the equations is a constant multiple of the other. For example, x+y=1, 2x+2y=2 has a second equation that is 2 times the first. This set of equations has "all real numbers" as its solution set. (Of course, y = 1-x.)

_____

* Non-linear equations may impose limits on the variables, so that "all real numbers" cannot be a solution.

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Determine the factors of x2 − 12x − 20.
FrozenT [24]

Answer:

Step-by-step explanation:

Synthetic division is one way to determine whether or not a given number is a root of the quadratic.  x^2 − 12x − 20 can be rewritten as x^2 - 12x + 36 - 36 - 20, or (x - 6)^2 - 56, which does not have integer solutions:

(x - 6)^2 - 56 = 0 becomes (x - 6)^2 = 56, which works out to x - 6 = ± 2√14.

None of the possible roots suggested in this problem turns out to be an actual root.

correct response: PRIME

3 0
3 years ago
Can someone please help me with this?
madreJ [45]

Answer:

2.664 * 10^{7}

Step-by-step explanation:

6 0
2 years ago
Given the system of equations, what is the solution?<br><br> 2x + y = 7<br> 2x - 3y = -1
eduard

Answer: Point Form - (5/2, 2) Equation Form - 5/2, y = 2

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
5÷x-4 - 2÷x+2 = 4÷x-4
Alborosie
I'd suggest you begin by subtracting 4 / (x-4) from both sides.  Doing that would leave you with    1 / (x-4)   -     2 / (x+2) =  0.

LCD is (x-4)(x+2).  Mult. all three terms by (x-4)(x+2).  The resulting equation is 

x+2 - 2(x-4) = 0.     Then x+2 = 2x - 8  =>  x = 10

Subst. 10 for x in the original equation to verify that 10 is indeed a solution.


8 0
3 years ago
Solve pls brainliest
nadezda [96]
The answer is 5 yd.

Take the side (16 yd) and subtract it with what you already know (11 yd)
3 0
3 years ago
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