Can somone help me please?

(a + b) = (b + a)
(a - b) = -1x(b - a)
(a + b)² = (a² + 2ab + b²)
(a - b)² = (a² - 2ab + b²)
(a - b)x(a + b) = a² - b²

If you have a calculator, you might find it easy to turn fractions into float-point decimal values instead. For instance, if you have an equation that looks like 5/6x - 22x = 3, then you can always turn that into 0.83x - 22x = 3 (note: 0.8 is followed by an infinite number of 3's, so just put an overline on top of the 3 to indicate the float value repeats infinitely). So, just subtract 22x from that, and end up with -21.166666...X = 3. So divide both sides with -21.166666..., and get your happy results. Teachers don't seem to appreciate using tons of decimals, but if you can keep those "overlines", it's not faulty in any ways.