[" 7.If "A={x in R/x^(2)+5|x|+6=0}," then "n(A)=],[[" (A) "2," (B) "0," (C) "4," (D) "1]]

(a)If A={x in R:x^2-5x+6=0} and B={x in R:x^2=9} , find AxxB .

U= [1,5],A={x|x in N ,x^2-6x+5=0} then A'=....

If 2 is a root of x^(2) + 5x + r = 0 then r = …

Let A={x in R,x^2-5x+6=0 and B={x:x in R,x^2=9} . Find (AuuB) and (AnnB)

f(x)=2x^(3)-6x^(2)+6x+5(n in R)then f'(x)=

Which of the following are one-one ,onto (or) bijections? Justify your answer. (i) f: R to R, f(x) =(2x+1)/3 (ii) f: N to N, f(x) = 2x+3 (iii) f:[0, infty) to [0,infty), f(x) = x^(2) (iv) f: R to R, f(x) =x^(2) (v) f: R to (0, infty), f(x) = 5^(x) (vi) f: (0, infty) to R, f(x) = log_(e)^(x) (vii) f: R to R, f(x) = {{:(x, if x gt 2),(5x-2, if x le 2):}

If A={x|x in N,xle5},B={x|x in Z,x^(2)-5x+6=0} , then the number of onto functions from A to B is