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Easy Proving: a+b=c and some more

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This theory helps proving a+b=c, especially if equations are hard to prove (plus some more). We also have unsolved mathematics problems that include relationship between a,b and c and they are hard to prove of disprove. Theory is here:

We have:

a,b,c

a,b,c are any possible numbers

How do we know if sum of any of two numbers (and which ones) is 3rd number?

We use this equation:

(c²-b²- a²):(b*a)=

If:

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- result is 2, than a+b=c and b+a=c

Proof:

If a+b=c; than c²=a²+2ab+b², so

Equation is: (c²-b²- a²):(b*a)=

= (a²+2ab+b²-b²-a²):(b*a)=2ab:(b*a)=2

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- result is -2, than a+b (or b+a) is not c. But, if we take bigger number of a and b and we swap it with c, than we will get correct result (for example:a is bigger than b, than:a+b=c is not true; but c+b=a is true (and b+c=a true also)).

Proof:

If a-b=c or(not and) b-a=c; than c²=a²-2ab+b², so

Equation is: (c²-b²- a²):(b*a)=

= (a²-2ab+b²-b²-a²):(b*a)=-2ab:(b*a)=-2

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- result is different than 2 or -2. Then all of next statements are false:

A+b=c

A+c=b

B+a=c

B+c=a

C+a=b

C+b=a

Proof:

Result of equation is different than in previous cases, meaning that our conclusion is correct.

______________________

Example #1:

a=2

b=4

c=6

a+b=c

2+4=6 : Correct or False?

(c²-b²- a²):(b*a)=2

(6²-4²-2²):(4*2)=

=(36-16-4):8=

=16:8=

=2

Because our result is 2, we know that 2+4=6 is correct.

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Example #2

a=2

b=5

c=3

a+b=c

2+5=3 : Correct or False?

(c²-b²- a²):(b*a)=

(3²-5²-2²):(5*2)=

=(9-25-4):10=

=(-20):10=

=-2

Because our result is -2, we know that 2+5=3 is not correct. But if we take bigger number of a and b and we swap it with c, than we will get correct result. In this case we swap b and c (this means that equation:2+3=5 is correct).

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Example #3:

a=2

b=7

c=3

a+b=c

2+7=3 : True of False?

(c²-b²- a²):(b*a)=

(3²-7²-2²):(7*2)=

=(9-49-4):14=

=(-44):14=

=-3,143

Because our result is not 2 and also not -2 we know that all of these statements are wrong:

A+b=c

A+c=b

B+a=c

B+c=a

C+a=b

C+b=a

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For easier understanding I have used simple examples to show this theory. As mentioned above, it becomes useful when equation is harder to prove or solve.

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Thank you for reading. Have a lovely day. Thoughts?

submitted by /u/OneSquareTwo
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