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Question

For what positive values of 'm', roots of the equation x2+mx+4=0 are distinct

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Solution

Consider the equation x2+mx+4=0
This is in the form ax2+bx+c=0. The co-efficients are a = 1, b = m, c = 4
=b24ac,=m24(1)(4),=m216
If roots are distinct, then >0
m216>0,m2>16,m>16m>4

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