Find the error in the equation.

[phoenix_nf]

16 - 36 = 25 - 45

16 - 36 + (81/4) = 25 - 45 + (81/4)

(4^2) - 2 * 4 * (9/2) + [(9/2)^2] = (5^2) - 2 * 5 * (9/2) + [(9/2)^2]

[4 - (9/2)]^2 = [5 - (9/2)]^2

taking sq. roots on both sides.

4 - (9/2) = 5 - (9/2)

Adding (9/2) on both sides we get:

4 = 5 (or) 2 + 2 = 5

(find the error)

__________________________________________

You can do a similar thing using the equation:

4 - 10 = 9 - 15

add (25/4) to both sides to get 2 = 3

[indianarchie]

doh man...do ur own math homework!

[Spyder2k]

[4 - (9/2)]^2 = [5 - (9/2)]^2

taking sq. roots on both sides.

4 - (9/2) = 5 - (9/2)

4 - (9/2) = -.5

5 - (9/2) = .5

when you did the square root you left out 'The square rot of a number is +/-', in this case we have a definite answer for '4 - (9/2)' for which the answer is negative, clearly left out in the proceding equation. Now i got one of me own

A = B
A^2 = AB
A^2 - B^2 = AB - B^2
(A+B)(A-B) = B(A-B)
(A+B) = B
A+A = A
2A = A
2 = 1

[phoenix_nf]

Gr8, now try it on u r friends....many dont get what hit em.

[FAT64]

That's an easy one, in line 4 you are dividing both sides by ( A - B ) which is zero!!

[MadGutts]

Blimey.. my shool daze are well and truely over! so i can't even remember half of it! including algebra....

... Not that anyone ever did understand algebra!!

[army20]

Tahy said on high school that i needed high maths to go into computing. I've forgot everything and i'm doing my job well

[phoenix_nf]

SPyder2K you gr8 man

the sq. root was the error.

example.

(2)^2 = 4

(-2)^2 = 4

but 2 <> -2

[sven]

hum.. wouldn't it be simpler just to say the equation is -20=-20?