Digital PSAT Math Practice Question 288: Answer and Explanation
Question: 288
If 
for all values of x, what is the value of b?
- A. 3
- B. 1
- C.
- D.
Correct Answer: D
Explanation:
(D) In the right side of the equation, only the x is being raised to the 9th power so you can get rid of the parentheses. The 2s cancel giving you
Because both exponents have the same base, you can set the exponents equal to one another:
You need to get b out of the denominator, so multiply both sides by b:
3 = 9b
Finally, divide both sides by 9 to isolate b:
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