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Can someone please answer these questions?

Can someone please answer these questions?-example-1
User SamClem
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1 Answer

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Keep in mind that you can gather only like terms. Two terms can be summed/subtracted if they involve the same powers of the same variables.

So, going point by point:

  1. We can subtract the terms, because they both involve the variable
    b, and we have
    3b-7b = (3-7)b = -4b
  2. We can sum the terms, because they all involve the variable
    a, and we have
    a+a-5a = (1+1-5)a = -3a
  3. We can't sum this terms: 3 is a pure number, while 3r involves the variable r.
  4. We can only sum the two terms: we have
    7t-8t-8 = (7-8)t-8 = -t-8
  5. We can't sum this terms: -20 is a pure number, while -15p involves the variable p.
  6. We can sum the terms, because they all involve the variable
    g, and we have
    -g-g-g = (-1-1-1)g = -3g
User Erison
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