Quadratic 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^2y^2 - 9
A
(Xy + 3)(xy - 3)
5
Q
4x^2 - 9
A
(2x + 3)(2x - 3)
6
Q
FOIL (a - b)(a + c)
A
a^2 + ac -ba -bc
7
Q
3^30 - 5^30
A
(3^15)^2 - (5^15)^2 = (3^15 - 5^15)(3^15 + 5^15
