g9math short q

1.If 4x2-6x+p is a perfect square , then p=……….
A. 4/9 B.9/4 C. 4 D. 9 E.16

1. x2+k=x have only one real root, find k.
   A. 1/4 B.-1/4 C. 4 D. -4 E.1
2. The solution set of x2-x=x(x-1) is
   A. {0} B. {0,-1} C. {1,0} D. R E.∅
3. The solution set of the quadratic equation 2x2=4x is
   . If the number 31200 is put in the form 3.12 ×10n, the value of n is
   A. 1 B. 2 C. 2 D. 4 E. 5
4. The scientific notation 3.5 ×103 multiplied by 3 is
   A. 1.05 ×102 B.1.05×1010 C. 1.05×103 D.1.05×109 E. 1.05×104
5. The scientific notation 8.2×10-4 + 5.4×10-4=………
   A.1.35×10-5 B. 1.36×10-4 C.1.36×10-3 D.1.36×10-7 E.1.36×103
6. Which of the following is (are) true?