To solve exponential equations where the variable appears in both the base and exponent (such as 2^x = x^4), apply strategic exponent rules by raising both sides to reciprocal powers to eliminate the variable from the exponent, then simplify using properties like (a^m)^n = a^(m*n) and a^(-n) = 1/a^n, ultimately equating bases to find the solution.
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99% FAIL This Olympiad Equation 😱 | Can You Solve It?”Added:
you out to solve this math Olympiad.
So, I want you guys to follow me step by step as I provide a solution to this equation.
We have 2 to the power of X is equal to X to the power of 4.
Now, look at this.
We have a power of X and also have a base of X.
Now, to solve this, first of all, let us let's raise both powers by 1 over X.
By doing that, we shall clear the above X in one side. So, we shall have 2 to the power of X all to the power of 1 over X will be equal to X to the power of 4 all to the power of 1 over X.
So, we shall cancel out this, so we shall have 2 to be equal to X to the power of 4 times 1 over X, we shall have 4 over X.
We still need to clear the fraction in the right hand side. So, to do that, let us multiply both powers again by um 1 over 4.
So, we shall have 2 to the power of 1 over 4 is equal to X to the power of 4 over X all to the power of 1 over 4.
All right?
So, this four will cancel out this four.
We shall have 2 to the power of 1 over 4 to be equal to X to the power of 1 over X.
Now, look at this.
I can rewrite this two as 2 to the power of 1 all to the power of 1 over 4. This is equal to X to the power of 1 over X.
I can further simplify this one as 4 divided by 4. So, this become 2 to the power of 4 divided by 4 because 4 over 4 is 1 all to the power of 1 over 4 to be equal to x to the power of 1 over x.
Now, to continue this in this place, I can bring out 1 over 4 from this 4 over 4.
So, this become 2 to the power of 2 to the power of 4 all to the power of 1 over 4 multiplied by this 1 over 4, so multiplied by 1 over 4 to be equal to x to the power of 1 over x.
Okay?
Now, 2 to the power of 4 is 16. So, this becomes 16 to the power of 1. 4 * 4 is also 16, so this is 1 over 16 to be equal to x to the power of 1 over x.
Now, let's do comparison in this equation because we want to set the base equal.
We are not doing that because the bases are are the same, but we just want to do the comparison to confirm the value of x.
So, if I say 1 over 16 to be equal to 1 over x, of course, when the numerator are the same, what do you do? You just equate x to be equal to what? 16. And that happens to be the final answer.
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