Sunday, November 30, 2014

What is the value of m in 4x^2+44x+m=0 so that the 2 roots are equal?show steps please

We are given the equation
4x^2+44x+m=0.


We'll use the relation that for an equation
ax^2 + bx +c = 0


The roots are given by : [-b
+sqrt(b^2-4ac)] / 2a and [-b - sqrt(b^2-4ac)]


Now as the
roots are equal it implies that sqrt(b^2-4ac) = 0


we have a
= 4 , b = 44 and c =m


substituting we
get


sqrt [ 44^2 - 4*4*m]
=0


=> 44^2 - 4*4*m
=0


=> 44^2 = 16
m


=> m = 44^2 /
16


=> m =
121


Therefore the value of m for the equation
having equal roots is 121.


[ We can see
that the root of the equation 4x^2 + 44x + 121 =0 is only -5.5 ]

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