evenitnf stre

A.12 B.48 C.192 D.256 E.512

1. If (5x-4y) = 4(2x-3y) , then x : y = ……….
   A. 3:8 B. 8:3 C. 12: 17 D. 6:-13 E. 13:18
2. If x:y = 2:3 , find (x2 + y2):(x2-y2).
   A. 2:5 B. 13:-5 C.6:13 D. 6:-13 E. (9:13)
   20.Let x,y,z be three unequal numbers . Which of the following is (are) equal to x:y:z?
   1.5x: 5y : 5z 2. x+1 : y+1 : z+1 3. x2 : y2 : z2
   A.1 only B. 2 only C. 1 and 2 only D. 2 and 3 only E. 1,2 and
   . From a quadratic in x whose roots are 4+√5 and 4- √5.
   A. x2+5x+6=0 B.x2+8x+11=0 C. x2-5x+6=0 D. x2-8x+11=0 E. x2-4x+5=0
   23.If α and β are roots of the equation of ax2+bx+c=0 , then α2 + β2=…………
   A.b2-4ac B.(b^2-2ac)/a2 C.ab2-2ac D. (ab^2-2ac)/a2 E.(-b+b^2-4ac)/2a