anonymous
  • anonymous
Could someone walk me through this problem?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
\[1. (2x^3 + x - 10) - (5x^2 - 7x) + (3x^3 - 2x^2 - 9x + 3)\]
anonymous
  • anonymous
first you need to distribute.
anonymous
  • anonymous
\[2x ^{3}+x-10-5x ^{2}+7x+3x ^{3}-2x ^{2}-9x+3\] You add the like terms together

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anonymous
  • anonymous
Does that kind of help?
anonymous
  • anonymous
Okay, so: \[2x^3(-5x^2 + 7x)\] -10x^5 + 14x^4 \[x(-5x^2 + 7x)\] 5x^3 - 7x^2 \[-10(-5x^2 + 7x)\] 50x^2 - 70x -10x^5 + 14x^4 + 5x^3 - 7x^2 + 50x^2 - 70x, then combine like terms.
anonymous
  • anonymous
-10x^5 + 14x^4 + 5x^3 + 43^2 - 70x? + (3x^3 - 2x^2 - 9x + 3)
anonymous
  • anonymous
Do I have to distribute again or just combine like terms?
jdoe0001
  • jdoe0001
yes \(\bf (2x^3 + x - 10) - (5x^2 - 7x) + (3x^3 - 2x^2 - 9x + 3)\\ \quad \\ 2x^3 + x - 10 - 5x^2 + 7x + 3x^3 - 2x^2 - 9x + 3\\ \quad \\ (2x^3+ 3x^3) (+ x+ 7x- 9x) (- 5x^2 - 2x^2) (- 10+ 3)\)
anonymous
  • anonymous
The way @jdoe0001 did it is correct
anonymous
  • anonymous
Oh, okay. So, is the answer then 6x^6 + 17x - 3x^2 - 7?
jdoe0001
  • jdoe0001
\(\bf -5 -2 \ne -3\)
anonymous
  • anonymous
Oops, 6x^6 + 17x - 7x^2 - 7
jdoe0001
  • jdoe0001
well... \(\bf 1 + 7 -9 \ne 17\)
anonymous
  • anonymous
I messed the whole thing up, I guess? 6x^6 - 1x - 7x^2 - 7
anonymous
  • anonymous
Are you supposed to add or multiply the first part of the problem? (2x^3 + 3x^3).
jdoe0001
  • jdoe0001
notice that \(\bf (2x^3+ 3x^3)\) is not multiplying, is ADDING
jdoe0001
  • jdoe0001
they just happen to be grouped in paretheses
anonymous
  • anonymous
There is multiplication when you distribute but after that everything else is either adding or subtracting
anonymous
  • anonymous
Alright, thank you both!
anonymous
  • anonymous
No Problem
jdoe0001
  • jdoe0001
yw

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