Question 13
IndicesSolve the equation 5x² = 25x+4
- A.−4, 2
- B.−4, −2
- C.4, −2
- D.4, 2
Show the answer and explanation
Answer: C (4, −2)
Explanation
25x+4 = 52x+8, so x² = 2x + 8, x² − 2x − 8 = 0, (x − 4)(x + 2) = 0: x = 4 or −2.
Solve the equation 5x² = 25x+4
Answer: C (4, −2)
25x+4 = 52x+8, so x² = 2x + 8, x² − 2x − 8 = 0, (x − 4)(x + 2) = 0: x = 4 or −2.