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### 15 Cards in this Set

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 complex numbers contain... in the form a+bi -imaginary numbers- when b≠0 -real numbers- when b=0 imaginary numbers... imaginary- a≠0 and b≠0 pure imaginary- a=0 but still b≠0 real numbers consist of... -rational numbers (can be expressed as a fraction) -irrational numbers (can't) rational... -integers- increments of 1 -rational numbers that aren't- eveything else integers -whole- 0 and up -negative- < 0 whole... natual- 1 and up zero-0 radical terms... radicand- in the radical index- the number sitting on the radical's nose we use the absolute value signs when... the index is an even number, and the power of the radicand is even conjugates conjugate of a + bi is a - bi complex # and its conjugate=real number powers of i i= square root of -1 i 2= -1 i 3= -i i 4= 1 quadratic formula -b ± √b2+ 4ac ------------- 2a discriminant is negative 2 imag conjugates 0 x int positive square 2 real rational roots 2 rat x int positive- not perf square 2 real irrational roots 2 irrational x int 0 2 real rational eaqual roots (aka- 1 double root) 1 x int