find the root using quadratic formula x square -4x-8=0
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x²-4x-8=0
comparing this with the equation ax²+bx+c= 0
a=1,b =-4,c=-8
x=-b+-√b²-4ac/2a
= 4+-√16-4.1.( -8)/2
= 4+-√16+32/2
= 4+-√48/2
=4+-√24
=4+-2√6
either, x= 4+2√6 or, x= 4-2√6
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