Question

1. What does the letter i mean or stand for in mathematics

Answer 1

1. The letter i referes to the imaginary numbers in mathematics.

2.i.i=-1

3.i.i.i=-i

As

`i=\sqrt[\square]{-1}`

Thus multiplying i two times gives us -i.

4. The given equation:

`2x^2-22=-7x`

Rearranging,

`2x^2+7x-22=0`

Solving,

`2x^2+11x-4x-22=0`
`(2x+11)(x-2)=0`

Solving,

`x=-(11)/(2),2`

The siolution is x=-11/2,2