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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?
 2 years ago
 2 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?
 2 years ago
 2 years ago

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mominanisarBest ResponseYou've already chosen the best response.1
factoring 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
 2 years ago

jhonyy9Best ResponseYou've already chosen the best response.0
so 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
 2 years ago

jhonyy9Best ResponseYou've already chosen the best response.0
mominanisar 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
 2 years ago

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

mominanisarBest ResponseYou've already chosen the best response.1
it is a typing mistake by me
 2 years ago
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