How do you find the letter(x) in a polynomial function

example : (1/4)x^3+2x-3x^2+1

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the

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X² + 4y² = 36 the major axis runs along: a) y=4x b) x-axis c) y-axis