Question

tìm x biết 2010x²-x-2011=0

Answer 1

2010x² + -1x + -2011 = 0

<=> -2011 + -1x + 2010x2 = 0

<=> -2011 + -1x + 2010x2 = 0

<=> (-1 + -1x)(2011 + -2010x) = 0

=> -1 + -1x = 0 hoặc 2011 + (-2010x) = 0

=> x = -1 hoặc x = \(\frac{2011}{2010}\)