Ch 2:Algebraic Identities Flashcards
1
Q
(x+y)²
A
= (x)² + (y)² + 2(x)(y)
2
Q
(x-y)²
A
= (x)² + ( y)² - 2(x)(y)
3
Q
(x)² - (y)²
A
= (x+y) (x-y)
4
Q
(x+a)(x+b)
A
= x² + x(a+b) + ab
5
Q
(x+y+z)²
A
= x² + y² + z² + 2xy + 2yz + 2zx
6
Q
(x+y)³
A
= x³ + y³ + 3xy(x+y)
7
Q
(x-y)³
A
= x³ + y³ - 3xy(x-y)
8
Q
x³ + y³
A
= (x+y)(x² + y² - xy)
9
Q
x³ - y³
A
(x-y)(x² + y² + xy)
10
Q
x³ + y³ + z³ - 3xyz
A
= (x+y+z) (x² + y² + z² - xy - yz -zx)
