PCH1: Basic Arithmetic & Algebra Flashcards

1
Q

Sum by difference

A

(a+b)(a-b) = a^2 - b^2

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2
Q

Difference of two squares

A

x^2 - y^2 = (x + y) (x - y)

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3
Q

sum of two cubes

A

x^3 + y^3 = (x+y) (x^2 - xy + y^2)

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4
Q

difference of two cubes

A

x^3 - y^3 = (x - y) (x^2 + xy + y^2)

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5
Q

sum of a square

A

(a + b)^2 = a^2 + 2ab + b^2

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6
Q

difference of a square

A

(a - b)^2 = a^2 - 2ab + b^2

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7
Q

quadratic formula

A

x = - b +/- √ b^2 - 4ac
———————————–
2a

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