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MATH 115 LECTURE 3

by: Stacy Downing

12

0

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MATH 115 LECTURE 3 MATH 115

Marketplace > Towson University > Mathmatics > MATH 115 > MATH 115 LECTURE 3
Stacy Downing
Towson
GPA 3.94

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Solving for x examples and rules
COURSE
Basic Math for The Sciences
PROF.
Ellen M. Johnson
TYPE
Class Notes
PAGES
1
WORDS
CONCEPTS
Math
KARMA
25 ?

Popular in Mathmatics

This 1 page Class Notes was uploaded by Stacy Downing on Thursday February 4, 2016. The Class Notes belongs to MATH 115 at Towson University taught by Ellen M. Johnson in Fall 2015. Since its upload, it has received 12 views. For similar materials see Basic Math for The Sciences in Mathmatics at Towson University.

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Date Created: 02/04/16
Lecture 3- Johnson  Solve for x. 1. 2x +5 =7 2x = 12 x =6 2. 0 = 2/3x – 2 2 = 3/2x  x =3 3. 6x – (3x – 5) = 17  6x – 3x – 5 = 17 3x = 12 x = 4  LEAST COMMON DENOMINATOR  GETS RID OF THE FRACTION x−3 = 5 − x+5 4. 4 14 7  LCD = 2 · 2 · 7 = 28 28(x−3) 5∙28 28(x+5) = − →7 (−3 =)0−4 x+( →1) x=11→x=1 4 14 7 x=2+ x−25 →LCD=10→5x=20+2 x−50→3x=−30→ x=−10 5. 2 5  ZERO PRODUCT PROPERTY (x+5 )x−2 =0→ x=−5,2 6. 2 1 7. 2 x +x−1=0→ 2 (−1 x)( =0)x= ,−1 2 2 −b± √ −4ac 2  QuadraticFormula:x= 2a , where ax + bx +c = 0 6± √6 −4(9)(−4) 1± √ 1. 9x -6x – 4 = 0 where a=9 b=-6 c=-4 →x= →x= 2(9) 3 2  Discriminant = b – 4ac  Square Root Property 2 2 o (x−6 )=64→ √(x−6 )=√64→x−6=±8→ x=14,−2 o YOU WILL GET TWO ANSWERS!

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