math 1: ratios and proportions; polynomials Flashcards
1
Q
in any ratio problem, write x after each number and use some given information to
A
solve for x
2
Q
directly proportional:
A
y/x = k
3
Q
inversely proportional:
A
xy = k
4
Q
(x - y)(x + y) =
A
x² - y²
5
Q
(x - y)² =
A
x² - 2xy + y²
6
Q
(x + y)² =
A
x² + 2xy + y²
