Answer:
see explanation
Step-by-step explanation:
Given a quadratic in standard form
f(x) = ax² + bx + c : a ≠ 0
• If a > 0 then minimum value U
• If a < 0 then maximum value ∩
f(x) = x² - 4x + 1 ← is in standard form
with a = 1 > 0
Thus f(x) = x² - 4x + 1 has a minimum value U
