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Unrelated to calculus, a simple mental trick for quickly calculating squares close to round numbers is to just break it into (a+b)^2=a^2+2ab+b^2. E.g. 51^2 = 25
by z2 8y ago
Unrelated to calculus, a simple mental trick for quickly calculating squares close to round numbers is to just break it into (a+b)^2=a^2+2ab+b^2. E.g. 51^2 = 2500+100+1=2601.
- SOLAR_FIELDS 8y agoThis is a slight reduction of the FOIL method, a classic in any first year algebra course. A decent trick to remember on tests when you are trying to quickly solve a lot of algebra problems.