rollcast said:why can you not take
xi = 90i
and multiply it by i
x*i*i = 90*i*i
x*-1 = 90*-1
-x=-90
x=90
Thanks
AL
AlephZero said:Possibly we are interpreting your "xi = 90i" wrongly, because that is only an approximate "copy" of the notation in the book.
Can you scan the page or photograph it and attach the image, so we can see exactly what the book says?
rollcast said:Its only a typed additional section that our maths teacher gave us to add to our textbook as it didn't cover imaginary and complex numbers.
What I typed, xi = 90i, is exactly how it is displayed on the sheet?
Mentallic said:The answer would never be xi = ... where x is the value you were trying to find and i is the imaginary number. Either it's meant to be xi where i is subscripted or it's simply a typo.
Think about it, would the answer book ever intentionally say 2x = 10?
rollcast said:I just compared my book with a friends and the rest of the solution is on the back of the page but its blank on mine.
Imaginary numbers are numbers that can be written as a real number multiplied by the imaginary unit i, which is defined as the square root of -1.
Imaginary numbers are needed to solve certain mathematical problems that cannot be solved with real numbers alone. They are particularly useful in solving equations and problems involving square roots of negative numbers.
Imaginary numbers are represented by the letter i, where i^2=-1. They can be written in the form a+bi, where a is the real part of the number and bi is the imaginary part. For example, 3+4i is an imaginary number where a=3 and b=4.
The main difference between real and imaginary numbers is that real numbers can be plotted on a number line, while imaginary numbers cannot. Real numbers also include all rational and irrational numbers, while imaginary numbers only include numbers with the imaginary unit i.
Yes, imaginary numbers are used in various fields such as engineering, physics, and economics. They are particularly useful in solving problems involving waves and oscillations, as well as in electrical engineering for calculating AC circuits.