SOLUTION: i need help with my - and + signs what are the rules
Algebra.Com
Question 458473: i need help with my - and + signs what are the rules
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
Rule 1:
Addition of two Numbers with the sign
The result is the of the numbers with the sign ( the sign of the two numbers ) .
When we add two numbers we get a number. Example : .
When we add two numbers we get a number. Example: .
Rule 2 :
Addition of two numbers with signs the is the between the numbers with the sign of the" " .
Example:
Rule 3 :
Multiplication and signs :
The basic rules for multiplication and signs are as follows
This can be expressed as follows that
(a) when we multiply two numbers with the same sign we get
( b) when we multiply two numbers with difference signs we get a
Example :
Rule 4 : Letters
Letters are often used in place of numbers , letters are often referred to as or .
Rules 1,2,3 above apply to all calculations with letters , we have to remember which applies to letters that is , in other words we can only add x's to x's and y's to y's etc .
Example
....Note also means times.
or
}
or
Rule 5 : Brackets
(a) A number immediately outside a bracket means that everything inside the bracket gets multiplied by that number
Ex.:
(b)Minus sign outside a bracket will change all the signs inside the brackets when the brackets are removed :
Ex.:
(c)Minus number outside a bracket does two things
(1) everything inside the bracket gets multiplied by the number and
(2) all the signs change
Brackets by brackets :
Multiply everything in the second bracket by everything in the first bracket and tidy it up .
Ex.:
RELATED QUESTIONS
Im trying to help my son with signed numbers. What are the basic rules for the signs in... (answered by josmiceli)
I need help with notations. I don't understand which signs mean what. I have a question... (answered by stanbon)
I am doing Linear Programming and need help with finding the vertecies so i can find the... (answered by venugopalramana)
What are the signs... (answered by richard1234)
Solve for x and y:
2x-7y=-1
3x-2y=7
My problem is that the signs are the same for... (answered by Theo)
After 30 yrs I am "back at it". I need your help using the rational zero theorem,... (answered by stanbon)
I keep missing something? I don't know the rules of how to do this problem? My answers... (answered by lwsshak3)
I need help working through this problem. Mostly just B with Descartes law of signs. Is... (answered by Aldorozos)
What is a subspace ? How do you prove that it is a subspace ?
I know that it is a... (answered by robertb)