find k, if m = -7/5 is a root of equations 5m^2+2m+k=0.
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Solution :
Substitute m = -7/5 in given quadratic
equation 5m² + 2m + k = 0,
=> 5( -7/5 )² + 2( -7/5 ) + k = 0
=> 49/5 - 14/5 + k = 0
=> ( 49 - 14 )/5 + k = 0
=> 35/5 + k = 0
=> 7 + k = 0
=> k = - 7
••••
Substitute m = -7/5 in given quadratic
equation 5m² + 2m + k = 0,
=> 5( -7/5 )² + 2( -7/5 ) + k = 0
=> 49/5 - 14/5 + k = 0
=> ( 49 - 14 )/5 + k = 0
=> 35/5 + k = 0
=> 7 + k = 0
=> k = - 7
••••
IshitaJaiswal:
Thank U so much.
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