I can now finally dispense with my statistical tables - Binomial, Poisson and even Normal distributions are now covered completely. This was, for me, the main reason for my purchase. The previous limit was 3 x 3 matrices, although even this was sufficient to handle most exam questions. Matrices can now be input up to 5 x 5, with the calculator happily finding determinants, sums, products and even inverses. Also, by using the Inequality function on a quadratic, cubic or quartic polynomial, one can quickly find the points on the graph (if any) where it crosses the x-axis. Similarly systems of simultaneous equations now go up to four equations in four unknowns. It can find a root for any general equation using Newton-Raphson to refine a user-supplied initial approximation.
The machine will solve algebraically any polynomial equation up to 4th degree (quartics). Incredible power to solve equations and systems of equations or inequalities. The new Random Integer function makes it easy to simulate coin flips, dice rolls and even card selections or lottery draws, opening up possibilities for a huge variety of mathematical experiments and games.įactorising large numbers into powers of prime factors with a single FACT command - amazing. The incredibly high definition screen and multi-line display options make it easy to enter calculations and see answers in textbook style and clarity - be they with fractions, brackets, surds (roots), or any combination. Some of the new features that make this compelling for me are as follows:
As a user of casio calculators, I am confident that the fx 991 ex is quite possibly the best classroom calculator they have ever produced.Īimed squarely at the Secondary school, this would be the calculator of choice for any student.
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