_13. What are the roots of the quadratic equation x2+2x+1=0?
A-1 B.1 C.2 D. -2
-14. Which of the following quadratic equations can be solved easily by extracting square roots?
A.2x2-4x=-4
B.2m2+10=60
C.4x2+2x-5=0 D. m?+5m-14=0