Question 20
IndicesFind x if 2x² = 4(x+4)
- A.−2 or 4
- B.−2 or 2
- C.−4 or 4
- D.−4 or 2
Show the answer and explanation
Answer: A (−2 or 4)
Explanation
4x+4 = 22x+8, so x² − 2x − 8 = 0, (x − 4)(x + 2) = 0: x = 4 or −2.
Find x if 2x² = 4(x+4)
Answer: A (−2 or 4)
4x+4 = 22x+8, so x² − 2x − 8 = 0, (x − 4)(x + 2) = 0: x = 4 or −2.