do you believe 4=5? Well take a look at this:
-20 = -20
16-36 = 25-45
4^2-9x4 = 5^2-9x5
4^2-9x4+81/4 = 5^2-9x5+81/4
(4-9/2)^2 = (5-9/2)^2
4-9/2 = 5-9/2
4=5
See? 4=5. Prove me wrong.
2007-01-21 13:16:16 · 5 answers · asked by blackmail8549 2 in Science & Mathematics ➔ Mathematics
your proof breaks down because line 6 does not logically follow from line 5.
You probably justified it by saying "we take the square root of both sides," failing to point out that the square root can have two answers; If two numbers have the same square, they aren't necessarily equal.
In your case, you have -1/2 and 1/2 which are not equal but have the same square, 1/4.
2007-01-21 13:25:19 · answer #1 · answered by Anonymous · 1⤊ 0⤋
(4-9/2)^2 = (5-9/2)^2 is correct, but that doesn't necessarily mean that 4-9/2 = 5-9/2.
For example, (-2)^2 = 2^2 but -2 does not equal 2. The fact that two numbers, when squared, give the same result, does not mean that the two numbers are equal. It just means that their absolute values are equal.
2007-01-21 21:27:15 · answer #2 · answered by Anonymous · 0⤊ 0⤋
im algebra the mathematical formula of a pentonecohedron revolves around the trhee digits in which would minus the 5 and multiply 7,square root proves a 7>-88 which proves you wrong my friend
2007-01-21 21:28:55 · answer #3 · answered by courtney p 1 · 0⤊ 0⤋
just because the square of a number is equal to the sqaure of a different number does not make the two numbers the same.
the negative of a number squared is the same as the number itself squared.
2007-01-21 21:32:53 · answer #4 · answered by anonimous 6 · 0⤊ 0⤋
wow that's very strange I can't figure it out...
2007-01-21 21:33:43 · answer #5 · answered by skateKad47 3 · 0⤊ 0⤋