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
