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 4 x 4, with the calculator happily finding determinants, sums, products and even inverses. The Solving and Inequality functions alone remove much of the need to turn to graphic calculators when working with graphs of polynomial functions. 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’t go higher because the general 5th power (quintic) is unsolvable – see Galois Theory! However, 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. Ratio calculations (example 3:10 is equivalent to ?:7) – the classic ‘Rule of Three’ which was an arithmetic nightmare to Victorian schoolchildren, is now just a tap away. 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 (up to 10 digits) 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: The only other calculator an A-Level student might need would be a graphical calculator, but the features of this one make even that an option rather than an essential. It retains the ease of use of the fx-83GT, but adds power and functionality that takes it literally to game-changing levels.Īimed squarely at the Secondary school market, and carefully featured to ensure that it stays within the parameters of public examination guidelines, this would be the calculator of choice for any student from Year 7 to Year 13 Further Mathematics. As a former Head of Mathematics, and a user of Casio calculators for over 40 years, I am confident that the fx-991EX is quite possibly the best classroom calculator they have ever produced.
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