Algebra Flashcards
1
Q
(x+y)² =
A
x² + 2xy + y²
2
Q
(x-y)² =
A
x² - 2xy + y²
3
Q
(x+y)(x-y) =
A
x² - y²
4
Q
(x+y)³ =
A
x³ + 3x²y + 3xy² + y³
5
Q
(x-y)³ =
A
(x-y)³ = x³ - 3x²y + 3xy² - y³
6
Q
(x³+y³) =
A
(x+y)(x²-xy+y²)
7
Q
(x³-y³) =
A
(x-y)(x²+xy+y²)
8
Q
Quadratic formula
A
x = -b±√(b²-4ac) / 2a
9
Q
Work problem equation
A
Part of work = (Duration of work) / (Duration of individual)
10
Q
Arithmetic progression
A
an = a1 + (n-1)d
11
Q
Arithmetic progression sum of all terms
A
S = (n/2)(2a + (n-1)d)
