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What numbers between 2 and 10 can only form one rectangular array?
Wiki User
∙ 14y ago
A number that can only form one rectangular array would be one that has only two factors, which means it is a Prime number. The factor pairs show the different rectangular arrays that can be formed.
2 = 1 x 2
3 = 1 x 3
5 = 1 x 5
7 = 1 x 7
4 = 1 x 4 and 2 x 2, so it can form two.
6 = 1 x 6 and 2 x 3, so it can form two.
8 = 1 x 8 and 2 x 4, so it can form two.
9 = 1 x 9 and 3 x 3, so it can form two.
10 = 1 x 10 and 2 x 5, so it can form two.
Wiki User
∙ 14y ago
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Why can't we add and subtract polar form of complex numbers and multiply and divide the rectangular form of complex number?
You can certainly multiply and divide with the rectangular form, but it is somewhat easier in polar form. This is especially relevant if you want to extend to more complicated operations, such as higher powers or taking roots. As for the polar form, any method to add and subtract them directly would probably be quite complicated, and directly or indirectly involve many of the same calculations that are done in converting from polar to rectangular, and back. Try it! (That is, try to deduce the formulas for adding two complex numbers in polar form.)
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You also need an equation for y in order to convert to rectangular form.
