Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
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Topic review (newest first)
Thanks, man. :-)
LOL, maybe I should put that on my to-do list.
Example of the first one:
[math]\Large x^2 - y^2 = (x + y)(x - y)[/math]
Now, using the math tag makes things a *little* slower, so best to use when other options fail. I often just cut and paste the symbols from the top of the forum, but there is no "^4", so that is where the math tag could help.
I guess 2 doesn't work here. :-(
Yeah, always remember the differance of two squares. x2 - y2 = (x + y)(x - y). Always be on the look out for numbers with integer square roots. For instance x2 - 25 = x2 - 52 = (x+ 5)(x-5). Also variables with even exponants other (then zero) can always be converted to a square. x4 = (x2)2
if you want to factor x^2-4 is easy: (x^2 - y^2) = (x + y)*(x - y), in your case (x+2)*(x-2)
Back in High School in my Pre Cal class, I was shown how to factor something like
Factoring (X^2 + 4)