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#1 Posted 2:53pm 28-01-10 quadratic......................The integral values of a for which the quadratic equation (x – a)(x – 10) + 1 = 0 has integral roots are a. -1, 3 b. 2, 3 c. 12, 8 d. -8, -12 |
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#2 Posted 3:42pm 28-01-10 Re: quadratic......................ans is c , use [im]http://codecogs.izyba.com/gif.latex?x%3D%5Cfrac%7B-B%5C%3B%5Cpm%5Csqrt%7BB%5E%7B2%7D-4AC%7D%20%7D%7B2A%7D[/im]
me : giv me some more time , giv me sum brain , giv me another chance , to write my paper once again ,
examiner : na na na na , na na na na , na na na na na na na na na na !!! |
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#3 Posted 3:45pm 28-01-10 Re: quadratic...................... haan qwert y sahi hai
J A I S H R I R A A M |
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#4 Posted 7:09pm 28-01-10 Re: quadratic......................Suppose the quadratic has an integer root α, then we must have [im]http://codecogs.izyba.com/gif.latex?%28%5Calpha-10%29%28%5Calpha-a%29%20%3D%20-1[/im] where both factors are integers i.e one of the factors is 1 is -1. Their difference is 2. Hence [im]http://codecogs.izyba.com/gif.latex?%7C10-a%7C%20%3D2%20%5CRightarrow%20a%3D8%2C12[/im] |
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