find the value of k for which the equation is X square + 5 x + 16 is equal to zero has a root
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Answered by
3
there is no k in the equation so
sorry mate !!!
sorry mate !!!
Answered by
0
we have
x^2+5kx+16=0
here,a=1,b=5k,and c=16
D=b^2-4ac
=(5k)^2-4(1)(16)
=25k^2-64
the given equation will have no real root if,D<0
=25k^2 - 64 < 0
=(5k)^2 - (8)^2 < 0
=(5k+8) (5k-8) < 0
=-8/5k < 8/5
x^2+5kx+16=0
here,a=1,b=5k,and c=16
D=b^2-4ac
=(5k)^2-4(1)(16)
=25k^2-64
the given equation will have no real root if,D<0
=25k^2 - 64 < 0
=(5k)^2 - (8)^2 < 0
=(5k+8) (5k-8) < 0
=-8/5k < 8/5
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