2(4d +4)=d +1I'm trying help my daughter with her math... this is the last one im stuck on.  Please help.

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samhouston's profile pic

samhouston | Middle School Teacher | (Level 1) Associate Educator

Posted on

Begin by using the Distributive Property on the left side.

2(4d + 4) = d + 1

8d + 8 = d + 1

Next subtract d from both sides.

7d + 8 = 1

Next, subtract 8 from both sides.

7d = -7

Finally, divide both sides by 7.

d = -1

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taangerine | Student, Grade 12 | (Level 1) Valedictorian

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Distribute the 2 into the 4d and 4.

8d+8=d+1

Combine like terms

7d=-7

Divide 7 to isolate x.

d=-1

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givingiswinning | Student, Grade 10 | (Level 1) Valedictorian

Posted on

2(4d +4)=d +1

8d + 8 = d+1

8d - d = 1 - 8

7d = -7

d = -1

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atyourservice | Student, Grade 11 | (Level 3) Valedictorian

Posted on

2(4d +4)=d +1

First use the distributive property

8d + 8 = d+1

combine like terms by moving the terms that look alike to the same side

8d - d = 1 - 8

7d = -7

divide by 7 because we are trying to solve b 

`(7d) / 7 = -7/7`

d = -1

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delrae86 | High School Teacher | (Level 1) eNoter

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Distribute first so 8d +8 = d + 1

next subract d from both sides so now 7d + 8 = 1

next subract 8 from both sides so now 7d = -7

last divide both sides by 7 and get d = -1.

ehyman-kdhs's profile pic

ehyman-kdhs | Student, Grade 11 | eNotes Newbie

Posted on

  • First, multiply the 2 into the equation on the left hand side

2(4d + 4) = d + 1

becomes

2*4*d + 2*4  = d + 1

8d + 8 = d + 1

  • next, subtract the 1 from (d + 1) both sides

8d + 8 = d + 1

- 8 - 8

8d = d - 7

  • then, subtract the d on the right hand side from both sides

8d = d - 7

-d   -d

you are left with 7d = -7

  • divide both sides by 7 to be left with just d

7d/7 = d

-7/7 = -1

  • and you are left with d = -1
leeroyjkns's profile pic

leeroyjkns | eNotes Newbie

Posted on

Thank you!  I ended up doing it the hard way.  I never thought I would have to do algebre again :)

8d+8=d+1

8d+8-d=1

7d+8=1

7d=-8+1

7d=-7

7d/7=-7/7  

d=-7/7 

d=-1

Thanks again, love this site!

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