Exercise 66

Simplify the following expressions if possible.

  1. \(\displaystyle{ {x^{3}+x^{3}}=}\)

  2. \(\displaystyle{ (x^3)(x^3)=}\)

  3. \(\displaystyle{ {x^{3}+x^{4}}=}\)

  4. \(\displaystyle{ (x^3)(x^4)=}\)

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