Question

решите пожалуйста уравнения с дискриминантом
5x^2+4x-1=0
16x^2-2x-5=0
28x^2-36x+11=0
-49x^2+21x-2=0

Answer 1

$49 x^{2} -21x+2=0, D=441-392=49, x_{1} = frac{4}{14} , x_{2}= frac{1}{7}$$16 x^{2} -2x-5=0, D=4+320=324, x_{1} = frac{5}{8} , x_{2}= frac{-1}{2}$$5 x^{2}+4x-1=0, D=b ^{2} -4ac, x_{1} = frac{-2+3}{5}= frac{1}{5} , x_{2} }= frac{-2-3}{5}=-1$$28 x^{2} -36x+11=0, D=1296-1232=64, x_{1}= frac{11}{14} , x_{2}= frac{1}{2}$