Question 2 • Math 3
An equation is quadratic in form when its powers can be written as 2n, n, and 0, so a substitution such as u = xⁿ turns it into a quadratic. In choice C, the powers are 6, 3, and 0; setting u = x³ gives 7u² + 36u + 5 = 0. Thus, the equation with 7x⁶ + 36x³ + 5 = 0 is quadratic in form.
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