review0 - Review for beginning of Math 242 This document...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Review for beginning of Math 242 This document covers some topics that you should have learned in Math 241 or whatever your equivalent course was. If x = 3, evaluate x 2 , - x 2 , 2 x 2 , and - 2 x 2 . If x = - 3, evaluate x 2 , - x 2 , 2 x 2 , and - 2 x 2 . Expand and simplify: ( a + b )( x - y + z ) = ( a + b )( a - b ) = ( a + b )( a 2 - ab + b 2 ) = ( a + b )( a - b ) = 2 - 3 2 + 3 · 2 - 3 2 - 3 = ( x 2 + x - x ) · x 2 + x + x x 2 + x + x = Be very aware that a + b is VERY DIFFERENT from a + b ( a + b ) 2 is VERY DIFFERENT from a 2 + b 2 sin( a + b ) is VERY DIFFERENT from sin a + sin b ‘n ( a + b ) is VERY DIFFERENT from ‘na + ‘nb Play around with this to convince yourself! Try some “nice” numbers, like a = 1 and b = 1. (For the sine function, examples of “nice” numbers might be a = π/ 2 and b = π/ 2.) 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Solve the inequalities. In other words, for each inequality, find all values of x that make the inequality true. x
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/07/2011 for the course MATH 242 taught by Professor Wang during the Spring '08 term at University of Delaware.

Page1 / 4

review0 - Review for beginning of Math 242 This document...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online