anonymous
  • anonymous
Need Helpp MEdalls!!!!!
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
\[\frac{ -4+20x }{ 4 }\] Simplify ?
ZeHanz
  • ZeHanz
Divide both -4 and 20x by 4
anonymous
  • anonymous
but 4 doesnt goin to -4

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ZeHanz
  • ZeHanz
It does: suppose you want to check a division, e.g. 18/3=6. Then you know 18 = 6*3. Now -4/4 = ???, then 4 * ???= -4. What number is ???
anonymous
  • anonymous
1
ZeHanz
  • ZeHanz
No, because 4*1=4 and not -4
anonymous
  • anonymous
-1
ZeHanz
  • ZeHanz
OK, so -4/4 = -1 Now you have to do: 20x/4
anonymous
  • anonymous
5
ZeHanz
  • ZeHanz
You lost x
anonymous
  • anonymous
5x
ZeHanz
  • ZeHanz
Done!
anonymous
  • anonymous
so thats my final answer are my final equation
ZeHanz
  • ZeHanz
You have -4 and 5x, so the final answer is... -4+5x
anonymous
  • anonymous
how bout this one \[-\frac{ 1 }{ 2 }(4-6a)\]
ZeHanz
  • ZeHanz
Use the distributive property: a(b-c)=ab-ac
anonymous
  • anonymous
I dont knoe the distributie Prop
ZeHanz
  • ZeHanz
It tells you how to get rid of the brackets! So you have to multiply -1/2 with 4 and also multiply -1/2 with -6a
anonymous
  • anonymous
okay I see
ZeHanz
  • ZeHanz
What do you get?
anonymous
  • anonymous
how do I multiply a fraction in to a number
ZeHanz
  • ZeHanz
Just forget the "-" for a while. 1/2 * 4 means you have four halves. How many is that?
anonymous
  • anonymous
2 wholes
ZeHanz
  • ZeHanz
OK. Now remember that if you multiply a negative number with a positive number, the outcome is negative. So: -1/2 * 4 = ...
anonymous
  • anonymous
-2
ZeHanz
  • ZeHanz
Right!, now the other one...
anonymous
  • anonymous
so for the other half it be-3 the i would be left with(-2- -3) and my answer be -5
ZeHanz
  • ZeHanz
You have to multiply, so -1/2 * -6a = ...
anonymous
  • anonymous
6 isn't negative that was the subtraction sign
ZeHanz
  • ZeHanz
OK, so save it for later. So: -1/2 * 6a = ...
anonymous
  • anonymous
-3
ZeHanz
  • ZeHanz
You lost the a
anonymous
  • anonymous
-3a ugh srry:p
anonymous
  • anonymous
so then my equation would be(-2 - -3a)
anonymous
  • anonymous
the my answer should be -5a right
ZeHanz
  • ZeHanz
No, -2 hasn't got an a with it, so you can't add it to 3a
ZeHanz
  • ZeHanz
So it would be -2+3a
ZeHanz
  • ZeHanz
-- = +
anonymous
  • anonymous
so it be 1a right
ZeHanz
  • ZeHanz
No, it would be -2+3a. This cannot be written shorter! If it was -2a+3a this would be 1a or a.
anonymous
  • anonymous
oh okay got it

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