find the valueofm if one root of the equation 2x2-8x-m = 0 is 5 / 2
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Put x=5/2 in given eqn
2(5/2)2-8(5/2)-m=0
2×25/4-8×5/2-m=0
25/2-20-m=0
25-40-2m=0
-15-2m=0
m=-15/2 ans
2(5/2)2-8(5/2)-m=0
2×25/4-8×5/2-m=0
25/2-20-m=0
25-40-2m=0
-15-2m=0
m=-15/2 ans
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