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maw [93]
3 years ago
9

Find the solution set 2x^2 -2x -4 =0please use a comma to separate your answer.

Mathematics
1 answer:
mariarad [96]3 years ago
7 0

Answer:

2,-1

Step-by-step explanation:

2x^2 -2x -4 =0

Factor out a 2

2(x^2 -x-2) =0

What 2 number multiply to -2 and add to -1

-2*1 = -2

-2 +1 = -1

2(x-2) (x+1) =0

Using the zero product property

x-2 = 0               x+1 = 0

x-2+2=0+2       x+1-1=0-1

x=2                   x=-1

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The area of all the rectangles combined

Step-by-step explanation:

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2 years ago
A shop owner offered a 20%discount off the regular price of a mirror.The amount of the discount is $3.00
Scrat [10]

Answer:

A) $15

Step-by-step explanation:

let x represent the regular price of the mirror

so, 20% of x = 3

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Are these functional or non functional ?
svetoff [14.1K]

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Relation 3 is a function and Relation 4 is nog

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Doug, a student in this class, knows how to write programs in JAVA. Everyone who knows how to write programs in JAVA can get a h
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Missing Part of Question

Explain which rules of inference are used in the above

Answer:

Universal instantiation, Modus ponens and Existential generalization

Step-by-step explanation:

Splitting the Statement into two, we have

"Doug knows how to write program is Java"

and

"Doug can get a high paying job"

Represent Doug with x. Then the statements is rewritten as

P(x) = "x knows how to write program is Java"

and

Q(x) = "x can get a high paying job"

In logic, A premise is a statement in an argument that provides reason or support for the conclusion.

So, Statement 1 can be written as

1. P(x) ---- Premise

Then, we have

2. Vx(P(x) --> Q(x)) -- Premise. This mean that P(x) for all values in the domain.

The universal instantiation of (2) leads to

3. P(Doug) --> Q(Doug)

The modus ponens of the above gives

4. Q(Doug)

The existential generalisation from above gives

5. ƎxQ(x)

Which means someone in this class can get a high paying job.

PS:

Universal Instantiation is a valid rule of inference from a truth about each member of a class of individuals to the truth about a particular individual of that class; it is represented by VxP(x).

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4 0
3 years ago
1)<br> 0.1.x - 0.006 = 0.08.x + 0.134
skad [1K]

Answer:

x=7

Step-by-step explanation

left part + 0.006 = right part + 0.006

---->  0.1x   = 0.08x+0.14

left part -0.08x =right part - 0.08x

----> 0.02x=0.14

             x=7

6 0
3 years ago
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