UmarsBack
  • UmarsBack
Help, explain step by step.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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UmarsBack
  • UmarsBack
Solve: 3(x + 4) - 4(x + 3) = 7x + 16.
anonymous
  • anonymous
distribute the 3 and the -4 into the parentheses. what do you get?
UmarsBack
  • UmarsBack
3x+12 - 4x + (-12) = 7x +16

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anonymous
  • anonymous
you can make that + (-12) just -12. so 3x + 12 - 4x - 12 = 7x + 16 now you gotta combine your like terms
UmarsBack
  • UmarsBack
x = 7x + 16?
anonymous
  • anonymous
3 - 4 = -1, so your x should be negative -x = 7x + 16 now you have to move the 7x to the left side
UmarsBack
  • UmarsBack
6x = 16 /6 /6 x=3 ?
anonymous
  • anonymous
no. we have to do the opposite to both sides when moving the 7x to the other side. the opposite of 7x is -7x. so subtract 7x from both sides
UmarsBack
  • UmarsBack
7x = 16 -7x -7x
anonymous
  • anonymous
no :/ since we have -x on the left side, we have to do -1x - 7x, which is -8x. so -8x = 16 now you can divide both sides by -8 to solve for x
UmarsBack
  • UmarsBack
Ohh sorry, i get confused when it comes to integers! -8x = 16 -8x -8x x=-2
anonymous
  • anonymous
that's right! :D
UmarsBack
  • UmarsBack
Thank you for helping me!
anonymous
  • anonymous
no problem :]

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