If `x^4+y^4=17` and `x+y=1` , then what is the value of `x^2y^2-2x y` ? (a) 8 (b) 10 (c) 12 (d) 16

If 2x+3y=31,backslash backslash y-z=4 and x+2z=11, then what is the value of x+y+z?( a )12 (b) 13 (c) 15 (d) 16

If 3x-4y+z=7; 2x-z+3y=19 ; x+2y+2z=24 , then what is the value of z ? (a) 4 (b) 5 (c) 6 (d) 8

If 2x+y=5 and 3x-4y=2, then the value of 2xy is (a) 4 (b) 6 (c) 8 (d) 10

If 2x+y=17;y+2z=15 and x+y=9 then what is the value of 4x+3y+z?(a)41 (b) 43(c)45 (d) 55 (e) None of these

If x-y=1 and x^(2)+y^(2)=41, then the value of x+y will be (a)5 or 4(b)-5 or -4 (c) +-9(d)+-1

If the operation ^^ is defined by the equation x^^y=2x+y , what is the value of a in 2^^a=a^^3? (a) 0 (b) -1 (c) 1 (d) 4

If log_(2)x+log_(2)y>=6, then the least value of x+y is 4 (b) 8 (d) 16 (d) 32

If x o+ y=x^(2)+2y, what is the value of p if 4o+(3o+p)=50?(a)4(b)7(c)8(d)12.5

If 4x^(2)+y^(2)=1 then the maximum value of 12x^(2)-3y^(2)+16xy is

If x=5 and y=-2 , then find the value of (i) (8x-2y+5)/(2x+4ty+12) " "(ii) (5x-6y-7)/(3x+6y+12)