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Question

Find the zero of the polynomial in each of the following cases:
(i) p(x)=x+5
(ii) p(x)=x5
(iii) p(x)=2x+5
(iv) p(x)=3x2
(v) p(x)=3x
(vi) p(x)=ax,a0
(vii) p(x)=cx+d,c0,c,d are real numbers.

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Solution

To find zero of the polynomial, p(x)=0

(i) If p(x)=x+5=0 then x=5, i.e. 5 is the zero.

(ii) If p(x)=x5=0 then x=5, i.e. 5 is the zero.

(iii) If p(x)=2x+5=0 then x=52, i.e. 52 is the zero.

(iv)If p(x)=3x2=0 then x=23, i.e. 23 is the zero.

(v) If p(x)=3x=0 then x=0, i.e. 0 is the zero.

(vi) If p(x)=ax=0 then x=0, i.e. 0 is the zero.

(vii)If p(x)=cx+d=0 then x=dc, i.e. dc is the zero.

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