Question 3 • GA-Advanced Algebra: Concepts and Connections CR
An equation is quadratic in form when its variable powers can be written as 2n, n, and 0, so the substitution u = x^n makes it a quadratic equation. In choice C, the powers are 8, 4, and 0; setting u = x^4 gives 10u² + 7u + 1 = 0. Thus, the equation with terms 10x⁸, 7x⁴, and 1 is quadratic in form.
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