PCH1: Basic Arithmetic & Algebra Flashcards
1
Q
Sum by difference
A
(a+b)(a-b) = a^2 - b^2
2
Q
Difference of two squares
A
x^2 - y^2 = (x + y) (x - y)
3
Q
sum of two cubes
A
x^3 + y^3 = (x+y) (x^2 - xy + y^2)
4
Q
difference of two cubes
A
x^3 - y^3 = (x - y) (x^2 + xy + y^2)
5
Q
sum of a square
A
(a + b)^2 = a^2 + 2ab + b^2
6
Q
difference of a square
A
(a - b)^2 = a^2 - 2ab + b^2
7
Q
quadratic formula
A
x = - b +/- √ b^2 - 4ac
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