alleryWhich of the following is a quadratic equation?
A2x + 7 = 0 of degree one
Bx^2 - 5x + 6 = 0
Cx^3 + 4x = 0 of degree three
D1/x = 7 of fractional form
Answer & Solution
Correct answer: B. x^2 - 5x + 6 = 0
1. A quadratic has its variable's highest power equal to 2.
2. Option A is x^2 - 5x + 6 = 0 with a = 1.
3. Options B is linear, C is cubic, D is rational.
4. So only option A is quadratic.
_Source: Selina Concise Mathematics Class 10, Ch 5 Quadratic Equations (Mistral OCR'd PDF), section on identification_
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