## anonymous 3 years ago Need Helpp MEdalls!!!!!

1. anonymous

$\frac{ -4+20x }{ 4 }$ Simplify ?

2. ZeHanz

Divide both -4 and 20x by 4

3. anonymous

but 4 doesnt goin to -4

4. 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 ???

5. anonymous

1

6. ZeHanz

No, because 4*1=4 and not -4

7. anonymous

-1

8. ZeHanz

OK, so -4/4 = -1 Now you have to do: 20x/4

9. anonymous

5

10. ZeHanz

You lost x

11. anonymous

5x

12. ZeHanz

Done!

13. anonymous

so thats my final answer are my final equation

14. ZeHanz

You have -4 and 5x, so the final answer is... -4+5x

15. anonymous

how bout this one $-\frac{ 1 }{ 2 }(4-6a)$

16. ZeHanz

Use the distributive property: a(b-c)=ab-ac

17. anonymous

I dont knoe the distributie Prop

18. 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

19. anonymous

okay I see

20. ZeHanz

What do you get?

21. anonymous

how do I multiply a fraction in to a number

22. ZeHanz

Just forget the "-" for a while. 1/2 * 4 means you have four halves. How many is that?

23. anonymous

2 wholes

24. ZeHanz

OK. Now remember that if you multiply a negative number with a positive number, the outcome is negative. So: -1/2 * 4 = ...

25. anonymous

-2

26. ZeHanz

Right!, now the other one...

27. anonymous

so for the other half it be-3 the i would be left with(-2- -3) and my answer be -5

28. ZeHanz

You have to multiply, so -1/2 * -6a = ...

29. anonymous

6 isn't negative that was the subtraction sign

30. ZeHanz

OK, so save it for later. So: -1/2 * 6a = ...

31. anonymous

-3

32. ZeHanz

You lost the a

33. anonymous

-3a ugh srry:p

34. anonymous

so then my equation would be(-2 - -3a)

35. anonymous

the my answer should be -5a right

36. ZeHanz

No, -2 hasn't got an a with it, so you can't add it to 3a

37. ZeHanz

So it would be -2+3a

38. ZeHanz

-- = +

39. anonymous

so it be 1a right

40. ZeHanz

No, it would be -2+3a. This cannot be written shorter! If it was -2a+3a this would be 1a or a.

41. anonymous

oh okay got it