3
Answer: ASet 3: Quadratic Equations (Advanced)
Explanation
PROBLEM
Solve: x squared - 10x + 21 = 0. Find the larger root.
Solve: x squared - 10x + 21 = 0. Find the larger root.
A.✓ Correct
7
B.
8
C.
5
D.
14
Detailed Explanation
Choice A is the best answer. Factor: (x - 7)(x - 3) = 0. Roots are 7 and 3. Larger: 7
Why others are wrong:
B: 8 is incorrect because it does not satisfy the equation.
C: 5 is incorrect because it does not satisfy the equation.
D: 14 is incorrect because it does not satisfy the equation.