Q. What is the value of A when we rewrite 8x as A−9x ?Choose 1 answer:(A) A=8−9(B) A=−89(C) A=891(D) A=(−8)91
Expressing 8^x in the form of A^(-x/9): We need to express 8x in the form of A−9x. To do this, we need to find a value for A such that when raised to the power of −9x, it is equivalent to 8x.
Rewriting 8^x as (8^(1/9))^(9x): First, let's rewrite 8x as (891)9x because 8x=(891)9x. This is because raising a number to a power and then raising it to another power is the same as multiplying the exponents.
Taking the reciprocal of the base: Now, we want to match the form A−9x. To do this, we need to take the reciprocal of the base inside the parentheses, which will change the sign of the exponent. So, (891)9x can be written as (8−91)−9x.
Determining the value of A: We can now see that A must be equal to 8−91 because (8−91)−9x is in the form of A−9x with A being 8−91.
Correct answer: A = 8^(1/9): Therefore, the correct answer is A=891, which corresponds to choice (C).
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