Question 9
IndicesSolve for x if 25x + 3(5x) = 4
- A.1 or −4
- B.0
- C.1
- D.−4 or 0
Show the answer and explanation
Answer: B (0)
Explanation
Let p = 5x, so p² + 3p − 4 = 0, i.e. (p + 4)(p − 1) = 0. 5x can't be −4, so 5x = 1 and x = 0.
Solve for x if 25x + 3(5x) = 4
Answer: B (0)
Let p = 5x, so p² + 3p − 4 = 0, i.e. (p + 4)(p − 1) = 0. 5x can't be −4, so 5x = 1 and x = 0.