How many of the following are functions ? (i) f(x)=x5;{−1,0,1}→{0

1.	How many of the following are functions ? (i) f(x)=x5;{−1,0,1}→{0,1,2} (ii) f(x)=∓√x;{0,4,9}→{0,2,−2,3,−3} (iii) f(x)=√x;{0,4,9}→{0,2,−2,3,−3} (iv) f(x)=x2;{0,1,2}→{0,1,2,3,4}
Answer» How many of the following are functions ? (i) $f (x) = x^{5}; {- 1, 0, 1} \to {0, 1, 2}$ (ii) $f (x) = \mp \sqrt{x}; {0, 4, 9} \to {0, 2, - 2, 3, - 3}$ (iii) $f (x) = \sqrt{x}; {0, 4, 9} \to {0, 2, - 2, 3, - 3}$ (iv) $f (x) = x^{2}; {0, 1, 2} \to {0, 1, 2, 3, 4}$

How many of the following are functions ? (i) f(x)=x5;{−1,0,1}→{0,1,2} (ii) f(x)=∓√x;{0,4,9}→{0,2,−2,3,−3} (iii) f(x)=√x;{0,4,9}→{0,2,−2,3,−3} (iv) f(x)=x2;{0,1,2}→{0,1,2,3,4}

Answer»

How many of the following are functions ?

(i) $f (x) = x^{5}; {- 1, 0, 1} \to {0, 1, 2}$

(ii) $f (x) = \mp \sqrt{x}; {0, 4, 9} \to {0, 2, - 2, 3, - 3}$

(iii) $f (x) = \sqrt{x}; {0, 4, 9} \to {0, 2, - 2, 3, - 3}$

(iv) $f (x) = x^{2}; {0, 1, 2} \to {0, 1, 2, 3, 4}$