f(x) = x2 - 4x + 3 হলে, f(1) + f(3) এর মান কত?
সমাধান
সঠিক উত্তর: Option A
f(x) = x2 - 4x + 3
∴ f(1) = 1 - 4 + 3 = 4 - 4 = 0
∴ f(3) = 32 - 4 × 3 + 3 = 9 - 12 + 3 = 12 - 12 = 0
∴ f(1) + f(3) = 0 + 0 = 0
∴ f(1) = 1 - 4 + 3 = 4 - 4 = 0
∴ f(3) = 32 - 4 × 3 + 3 = 9 - 12 + 3 = 12 - 12 = 0
∴ f(1) + f(3) = 0 + 0 = 0
