Wednesday

January 28, 2015

January 28, 2015

Posted by **Walter** on Wednesday, June 6, 2007 at 1:25pm.

1.) 7 + (-9) + (-5) + 6

2.) [(-3)(-4)(-5)]/ (-2)(-3)]

Try reading the following sites' pages very carefully. Then make an attempt at doing the problem, and we'll see if you got it right:

http://www.jiskha.com/mathematics/algebra/distribution.html

(Broken Link Removed)

http://www.softmath.com/tutorials2/multiplying-dividing-adding-subtracting-integers.html

I will explain it simply okay. Searching sites is a waste of time.

-Subtracting Real Numbers-

If a and b are real number then a - b is = to a + (-b)

The paretheses indicate that number stays negative.

so: Step one

7+(-9)+(-5)+6 :: add negative 9 and 7, which translates to 7+(-9) or 7-9

7+(-9)= -2

-9+7 = -2

7 - 9 = -2

"you following?"

Step two

(-2) + (-5):: when you add two negatives the answer is negative.

-2 + -5 = -7

Step Three

(-7)+6 or 6-7

= -1

In tree form

7+(-9)+(-5)+6

(-2)+(-5)+6

(-7)+6

= -1

Problem # two

-Multiplying and Dividing Real Numbers-

*pointers*

-Multiplication of real numbers is just like whole numbers. Only you have to determine if the answer is negative or positive.

-when you mulitply two negatives together you get a positive answer.

-when you mulitply a positive and a negative you get negative answer.

- Brackets [ ] those things, indicate that the equation inside of the bracket is done first in the order of operations.

- when parentheses and/or brackets are next to each other without a sign it means to multiply.

So: Step one, remove the brackets by doing the equation inside.

Here is the tree

[(-3)(-4)(-5)](-2)(-3)]

[(-12)(-5)](-2)(-3)]

[(-60)](-2)(-3)]

[(-60)]6]

(-360)

-Step two was perform the operation outside of the bracket. (-2)(-3)=6

[(-60)]6]

now multiply

= (-360)

I hope I helped.

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