Eduprobe
Question:
The number of integral values of m for which the quadratic expression (1+2m)x² - (1+3m)x + 4(1+m), x∈R, is always positive, is:
6
3
8
7
Solution:
ax2+bx+cis always positive ifa>0andD=b2ac<0
6
3
8
7
ax2+bx+cis always positive ifa>0andD=b2ac<0