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Sagot :
Certainly! Let's walk through the process of solving the equation step-by-step:
We are given the equation:
[tex]\[ 2\left(\frac{1}{49}\right)^{x-2} = 14 \][/tex]
1. Isolate the exponential term:
First, divide both sides of the equation by 2 to isolate the exponential expression:
[tex]\[ \left(\frac{1}{49}\right)^{x-2} = 7 \][/tex]
2. Rewrite the exponential term:
Recall that [tex]\(\frac{1}{49}\)[/tex] can be written as [tex]\(49^{-1}\)[/tex]. So the equation becomes:
[tex]\[ (49^{-1})^{x-2} = 7 \][/tex]
Which simplifies to:
[tex]\[ 49^{-(x-2)} = 7 \][/tex]
3. Express 7 as a power of 49:
We recognize that [tex]\(7^2 = 49\)[/tex]. Therefore, [tex]\(7 = 49^{1/2}\)[/tex]. Substituting this into the equation:
[tex]\[ 49^{-(x-2)} = 49^{1/2} \][/tex]
4. Set the exponents equal to each other:
Since the bases are the same, we can set the exponents equal to each other:
[tex]\[ -(x-2) = \frac{1}{2} \][/tex]
5. Solve for [tex]\(x\)[/tex]:
Simplify the equation to get:
[tex]\[ -(x - 2) = \frac{1}{2} \][/tex]
Distribute the negative sign:
[tex]\[ -x + 2 = \frac{1}{2} \][/tex]
Subtract 2 from both sides:
[tex]\[ -x = \frac{1}{2} - 2 \][/tex]
Simplify the right-hand side:
[tex]\[ -x = \frac{1}{2} - \frac{4}{2} = -\frac{3}{2} \][/tex]
Finally, multiply both sides by -1:
[tex]\[ x = \frac{3}{2} \][/tex]
Thus, the solution to the equation is:
[tex]\[ x = \frac{3}{2} \][/tex]
Therefore, the correct answer is [tex]\(\boxed{\frac{3}{2}}\)[/tex].
We are given the equation:
[tex]\[ 2\left(\frac{1}{49}\right)^{x-2} = 14 \][/tex]
1. Isolate the exponential term:
First, divide both sides of the equation by 2 to isolate the exponential expression:
[tex]\[ \left(\frac{1}{49}\right)^{x-2} = 7 \][/tex]
2. Rewrite the exponential term:
Recall that [tex]\(\frac{1}{49}\)[/tex] can be written as [tex]\(49^{-1}\)[/tex]. So the equation becomes:
[tex]\[ (49^{-1})^{x-2} = 7 \][/tex]
Which simplifies to:
[tex]\[ 49^{-(x-2)} = 7 \][/tex]
3. Express 7 as a power of 49:
We recognize that [tex]\(7^2 = 49\)[/tex]. Therefore, [tex]\(7 = 49^{1/2}\)[/tex]. Substituting this into the equation:
[tex]\[ 49^{-(x-2)} = 49^{1/2} \][/tex]
4. Set the exponents equal to each other:
Since the bases are the same, we can set the exponents equal to each other:
[tex]\[ -(x-2) = \frac{1}{2} \][/tex]
5. Solve for [tex]\(x\)[/tex]:
Simplify the equation to get:
[tex]\[ -(x - 2) = \frac{1}{2} \][/tex]
Distribute the negative sign:
[tex]\[ -x + 2 = \frac{1}{2} \][/tex]
Subtract 2 from both sides:
[tex]\[ -x = \frac{1}{2} - 2 \][/tex]
Simplify the right-hand side:
[tex]\[ -x = \frac{1}{2} - \frac{4}{2} = -\frac{3}{2} \][/tex]
Finally, multiply both sides by -1:
[tex]\[ x = \frac{3}{2} \][/tex]
Thus, the solution to the equation is:
[tex]\[ x = \frac{3}{2} \][/tex]
Therefore, the correct answer is [tex]\(\boxed{\frac{3}{2}}\)[/tex].
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