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Rational roots  standard form of equation 
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#1
Dec2712, 07:00 AM

P: 13

Hi everybody!
I've hit a blank with regards to this 1 equation on a old exam paper  think I've overloaded myself a bit and just feel a bit like a airhead at the moment! I understand the actual method and getting to the answer but it starts off with a equation which you then need to get to a standard form to use the formula to check if the roots are rational. The initial equation is this : 4x^2 + 2kx  k = 2x Then on the memorandum this is taken to standard form so the info can be substituted into the formula Δ = b^2  4ac the standard form they then write that initial equation in is : 4x^2 + 2(k1)xk = 0 How do they get from 4x^2 + 2kx  k = 2x to this 4x^2 + 2(k1)xk = 0 The rest I understand entirely. Literally just the above has be scratching my head! Please help :) Thank you! 


#2
Dec2712, 07:06 AM

Sci Advisor
P: 820




#3
Dec2712, 07:14 AM

P: 13

Thank you!



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