the equation of ax2+bx+c=0 , then α2 + β2=…………
A.b2-4ac B.b2-2aca2 C.ab2-2ac D. ab2-2aca2 E.-b+b2-4ac2a
24.In one of the root of the equation x2+αx-14=0 is 2, then α=……….
A.7 B. 5 C. -5 D. 3 E. -7
- If 3x2+lx-5=(mx-1)(2-x)-3, then
A. l=3,m=5 B. l=-5,m=-3 C. l=-5,m=3 D. l=5,m=-3 E.l=5,m=3
- The solution set of {(x,y)|y=x2} {(x,y)|y=x+2} is
A. {(-1,1),(2,4)} B.{(-1,0),(2,0)} C.{(1,-1),(4,2)} D.{(0,-1),(0,2)} E. None of these
- If a2+b2=4 and (a-b)2=2, what is the value of ab?
A. 1 B.2 C. 2 D. 3 E.4
28.If x2-2x-15=(x+r)(r+s) for all value of x, one possible value for r-s is
A.8 B. 2 C.-2 D. -3 E. -5
- If ax2-bx-c=0, then x=………..
A. -b±b2+4ac2a B. -b±b2-4ac2a C. b±b2-4ac2a D.b±b2+4ac2a E. None of these
- The parabola y=x2-x-12 cuts the X-axis at A and B. Th
