Identities Flashcards
1
Q
(x + y)^2
A
x^2+ 2xy + y^2
2
Q
(x - y)^2
A
x^2 - 2xy + y^2
3
Q
x^2 – y^2
A
(x + y) (x – y)
4
Q
(x + a) (x + b)
A
x^2+ (a + b)x + ab
5
Q
(x + y + z)^2
A
x^2 + y^2 + z^2 + 2xy + 2yz + 2zx
6
Q
(x + y)^3
A
x^3 + y^3 + 3xy (x + y)
7
Q
(x - y)^3
A
x^3 - y^3 - 3xy (x - y)
8
Q
x^3 + y^3 + z^3 – 3xyz
A
(x + y + z)(x^2 + y^2 + z^2 – xy – yz – zx)
9
Q
x^3 + y^3
A
[x + y] [x^2 - xy + y^2]
10
Q
x^3 - y^3
A
[x-y] [x^2 + xy + y^2]
