Ch.2 Quadratics Flashcards
1
Q
how would you pull out a quadratic from
27x⁶ + 26x³ - 1
A
let a = x³
27a² + 26a - 1
2
Q
what does x∈R mean?
A
it means x is a real number because ∈ means “is a member of” and R represents real numbers
3
Q
what is a set of possible inputs for a function called?
A
the domain
4
Q
what is the set of possible outputs of a function called?
A
the range
5
Q
how does the discriminant show how many roots f(x) has?
A
b² - 4ac > 0 means 2 real roots
b² - 4ac = 0 means 1 repeated root
b² - 4ac < 0 means no real roots
