මේ ගාණ හදමු

[elaelkiri]

A හොයන්ඩ

 

[imhotep]

Isn't it 729 cubed? which is 387420489

 

[djnick]

kammali bn oya eka eka ewa hoyanda ba dan
ubama hoyaganin

 

[elaelkiri]

Isn't it 729 cubed? which is 387420489

ඒක තමා මාත් බැලුවෙ

 

[saminda_1980]

Ganan bahe ban

 

[sandun36]

9

basic ol maths

 

[djnick]

Ganan bahe ban

 

[shan4max]

9

basic ol maths

I think its 9^9

 

[imhotep]

I think its 9^9

9^9=729^3=387420489

 

[slrohan]

A=9

 

[shiran987]

A හොයන්ඩ

Found it.

 

[shan4max]

9^9=729^3=387420489

Amen

 

[elaelkiri]

Found it.

 

[elaelkiri]

9

basic ol maths

කොහොමද බං හැදුවෙ..

 

[elaelkiri]

A=9

හදපු විදිය කියල දෙන්ඩ

 

[sandun36]

r is common
Compare right with left side.
If 729 can be written as X^(1/3)
left side of equation = X^(1/3 *3r) = X^r
Hence X=A
Therefore;
X^(1/3) = 729
X = 9 = A

 

[elaelkiri]

r is common
Compare right with left side.
If 729 can be written as X^(1/3)
left side of equation = X^(1/3 *3r) = X^r
Hence X=A
Therefore;
X^(1/3) = 729
X = 9 = A

 

[imhotep]

r is common
Compare right with left side.
If 729 can be written as X^(1/3)
left side of equation = X^(1/3 *3r) = X^r
Hence X=A
Therefore;
X^(1/3) = 729
X = 9 = A

Till the last step the logic is correct.. Fine, but
If x^(1/3) = 729... i.e the cube root of x = 729 (NOT the cube of x or x^3)
then x= 729^3 = 387420489

 

[jamiezue]

729 ^3r =A^r

729^3r ={cube root(A)}^3r
since the numbers are equal with exponents and exponents are the same, numbers should be equal
then,
729= cuberoot of A
A =387420489????

 

[imhotep]

729 ^3r =A^r

729^3r ={cube root(A)}^3r
since the numbers are equal with exponents and exponents are the same, numbers should be equal
then,
729= cuberoot of A
A =387420489????

Yes.. what's confusing?
729 = cuberoot of A
Then A= cube of 729 which is 387420489

If you all still don't get it let r=1..
Then 729^3 = A
Pretty obvious.. isn't it?