Selective Question

Calculate the sum of the expression

2^x+2^x+2^x+2^x=

  1. 2^{x+2}

  2. ×

    2^{2x}

  3. ×

    2^{4x}

  4. ×

    2^{2x+2}

  5. ×

    2^{8x}

Steven Zheng Steven Zheng posted 1 week ago


Answer

  1. The sum of the four identical quantities is 4 times of one of those quantities, so the sum of the four terms 2^x is 4 times 2^x

    4×2^x = 2^2 × 2^x=2^{x+2}

Steven Zheng Steven Zheng posted 1 week ago

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