Classify the following polynomials as polynomials in one-variable, two variables etc:

(i) x2 -xy +7y2

(ii) x2 -2tx + 7t2 -x +t

(iii) t3 -3t2 +4t -5

(iv) xy +yz +zx

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1 Answers

(i) x2 -xy +7yis a polynomial in two variables x,y.

(ii) x2 -2tx + 7t2 -x +t is a polynomial in 2 variables x, t.

(iii) t3 -3t2 +4t -5 is a polynomial in 1 variables t.

(iv) xy +yz +zx is a polynomial in 3 variables x, y, z. 

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