alleryWhich of the following is a quadratic equation?
Ax³ + x + 1 = 0
Bx + 1/x − 2 = 0
Cx² − 4x + 4 = 0
D2 · x + 5 = 0
Answer & Solution
Correct answer: C. x² − 4x + 4 = 0
Quadratic means highest power is exactly 2. Option A is linear. C is cubic.
D is not a polynomial in standard form. Only B fits.
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