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 3 years ago
I'm trying to solve 2x^2+11x21 by quadratic formula. Factoring gives 3/2, 7, but by the formula (which should always work), I get: (11/4)+/((22/4)(42)^(1/2)). Can anyone help me spot my stupid error?
 3 years ago
I'm trying to solve 2x^2+11x21 by quadratic formula. Factoring gives 3/2, 7, but by the formula (which should always work), I get: (11/4)+/((22/4)(42)^(1/2)). Can anyone help me spot my stupid error?

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mominanisar
 3 years ago
Best ResponseYou've already chosen the best response.1factoring gives 3/2, 7, the quadratic formula is x=(b±sqrt(b^24ac))/2a from your equation a=2,b=11,c=21 put values in formula x=(11±sqrt(121(168)))/2x2 x=(11±sqrt(289))/4 x=(11±17)/4. x=3/2, 7

jhonyy9
 3 years ago
Best ResponseYou've already chosen the best response.0so if factoring this is right (2x3)(x+7)=2x2+11x21 so than your got solutions x=3/2 and x=7 is right,correct sure always

jhonyy9
 3 years ago
Best ResponseYou've already chosen the best response.0mominanisar ATTENTION in this calcules are some errore because inside squarroot there not is minus 168 correct,right is plus 168 and in thgis way will get these correct factorized resultes

mominanisar
 3 years ago
Best ResponseYou've already chosen the best response.1i am seriously sorry actually this step is likex=(11±sqrt(121(168)))/2x2 new onex=(11±sqrt(121(168)))/2x2 because 'c' is minus

mominanisar
 3 years ago
Best ResponseYou've already chosen the best response.1it is a typing mistake by me
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