# Category : Science and Education

Archive : AYRFCAL1.ZIP

Filename : CI_3.HLP

Review of Algebraic Expressions and Exponents

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You MUST have all the following information at your fingertips at all times.

You have NO CHANCE of passing calculus without it.

(a + b) (c + d) = ac + ad + bc + bd

2 2 2

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

2

(x - a) (x - b) = x - (a + b)x + ab

2 2

(a - b) (a + b) = a - b

2 2 3 3

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

If a and b are positive integers:

a b a+b

x x = x

a

x a-b 1

ÄÄÄÄ = x = ÄÄÄÄÄÄ

b b-a

x x

a b ab

(x ) = x

a a a

(xy) = x y

a a a

(x/y) = x / y

ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿

³ Common Mistakes ³

ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ

WRONG - (x - y) = -x - y RIGHT - (x - y) = -x + y

WRONG 2(x + y) = 2x + y RIGHT 2(x + y) = 2x + 2y

2 2 2 2 2 2

WRONG (x + y) = x + xy + y RIGHT (x + y) = x + 2xy + y

2 2 2 2

WRONG (x - y) = (x - y)(x + y) RIGHT (x - y) = x - 2xy + y

2 3 5 2 3 6

WRONG (x ) = x RIGHT (x ) = x

2 3 6 2 3 5

WRONG x x = x RIGHT x x = x

This is the end of the help file. Press the ESC key to return to the quiz

question you were doing.

Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/