Question

Could someone please check my math questions? any help will be greatly appreciated!
4. Solve:
5|2x + 1 | = 55
Divide both side by 5: |2x+1|=11
2x+1=11 and 2x+1= -1
+1 +1 +1 +1
2x = 12 2x = -10
X=5 x=-6

What my teacher said was wrong~~
2x+1=11 and 2x+1= -11 YES, for both of these!
+1 +1 Absolutely not, why?

5. Solve:
1/2|4x – 8| - 7 = 3
½|4x-8|=10
|4x-8|=20
4x-8=20 or -4x+8=20
X=7 or x=-3
What my teacher said was wrong~~ missing steps at the end....

6. Evaluate the given expressions when a = 3, b = -3, c = 4, and d = -1.
c|a-b| + d
= -3|3-(-3)|
=-1(-6)=-6
Answer is -6
What my teacher said was wrong~~ incorrect substitution at the end

Answer 1

v\4. Solve:
5|2x + 1 | = 55
Divide both side by 5: |2x+1|=11
###Now subtract 1 from each side
###2x=10
###Now divide each side by 2
### x=5 I have no clue what your teacher meant.

2x+1=11 and 2x+1= -1
+1 +1 +1 +1
2x = 12 2x = -10
X=5 x=-6

What my teacher said was wrong~~
2x+1=11 and 2x+1= -11 YES, for both of these!
+1 +1 Absolutely not, why?

5. Solve:
1/2|4x – 8| - 7 = 3
½|4x-8|=10
|4x-8|=20 ### Correct

4x-8=20 or -4x+8=20
### steps missing here, you did it in your head.
X=7 or x=-3
What my teacher said was wrong~~ missing steps at the end....

6. Evaluate the given expressions when a = 3, b = -3, c = 4, and d = -1.
c|a-b| + d
= -3|3-(-3)|
***-3*6= -18
=-1(-6)=-6
Answer is -6
What my teacher said was wrong~~ incorrect substitution at the end

Answer 2

Thank you soo much!! I really appreciate your help!