The problem asks to find the value of $x$ in the equation $16 \times 2^{(x+1)} = 4^x \times 8^{(1-x)}$.

AlgebraExponentsEquationsSolving EquationsSimplification
2025/4/11

1. Problem Description

The problem asks to find the value of xx in the equation 16×2(x+1)=4x×8(1x)16 \times 2^{(x+1)} = 4^x \times 8^{(1-x)}.

2. Solution Steps

First, rewrite all the numbers as powers of 2:
16=2416 = 2^4
4=224 = 2^2
8=238 = 2^3
So the equation becomes:
24×2(x+1)=(22)x×(23)(1x)2^4 \times 2^{(x+1)} = (2^2)^x \times (2^3)^{(1-x)}
Using the property am×an=am+na^m \times a^n = a^{m+n} and (am)n=amn(a^m)^n = a^{mn}, we have:
24+x+1=22x×23(1x)2^{4+x+1} = 2^{2x} \times 2^{3(1-x)}
2x+5=22x+33x2^{x+5} = 2^{2x+3-3x}
2x+5=23x2^{x+5} = 2^{3-x}
Since the bases are equal, we can equate the exponents:
x+5=3xx+5 = 3-x
Add xx to both sides:
2x+5=32x+5 = 3
Subtract 5 from both sides:
2x=22x = -2
Divide by 2:
x=1x = -1

3. Final Answer

D. -1

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