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Question 1

what does it mean if the expression under the root is negative (when finding roots of a quadratic equation)?

Answer 1

there is no real solutions

Question 2

symbol of imaginary number

Answer 2

i

Question 3

what is i equal to?

Answer 3

square root of -1

Question 4

why do we use i?

Answer 4

so we can represent roots of quadratics that we couldn’t previously do with real numbers

Question 5

what are complex numbers

Answer 5

sums of real and imaginary numbers
z=a+bi

Question 6

usually the i goes after the number
when does it go before and why is this

Answer 6

when it is with a surd: i root7
when it has a number in-front of the the i is between: 3i root7
this is so we don’t confuse the i as being under the root too

Question 7

(2+3i)+(4+i)

Answer 7

6+4i