X²+4x+5=0 by
formula method
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b square -4ac.
= 4 sqaure-4*1*3
=16-4*3
=16-12
=4
-b +-root b square -4ac/2a
=-4+-root4/2*1
=-4+-2/2
=-4+2/3
=-2/2
=-1
or
=-4-2/2
=-6/2
=3
= 4 sqaure-4*1*3
=16-4*3
=16-12
=4
-b +-root b square -4ac/2a
=-4+-root4/2*1
=-4+-2/2
=-4+2/3
=-2/2
=-1
or
=-4-2/2
=-6/2
=3
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