Question

${2}^{x + 2} + {2}^{ x - 1} = 9$
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Answer 1

Step-by-step explanation:

${2}^{x + 2} + {2}^{ x - 1} = 9$

2^x [2²+2^(-1)] = 9. ( taking common of 2^x )

2^x = 9/ 4.5

2^x = 2

so , x = 1

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