Question 21
Quadratic EquationsFind the solution of the equation x − 8√x + 15 = 0
- A.3, 5
- B.−3, −5
- C.9, 25
- D.−9, 25
Show the answer and explanation
Answer: C (9, 25)
Explanation
Let u = √x: u2 − 8u + 15 = 0 gives u = 3 or 5. So x = 9 or 25.
Find the solution of the equation x − 8√x + 15 = 0
Answer: C (9, 25)
Let u = √x: u2 − 8u + 15 = 0 gives u = 3 or 5. So x = 9 or 25.