Multiple Choice Question (MCQ)
Calculate the sum of the expression
2^x+2^x+2^x+2^x=
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✓
2^{x+2}
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×
2^{2x}
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×
2^{4x}
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×
2^{2x+2}
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×
2^{8x}
Answer
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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}