Question

Решите пожалуйста!!! 3x^2-11x+15=0 15x^2+11x+2=0    7x^2-3x=0    

Answer 1

$3x^{2}-11x+15=0\D=b^{2}-4ac=11^{2}-4*3*5=-59\Net korney\\15x^{2}+11x+2=0\D=b^{2}-4ac=11^{2}-4*15*2=1\x_{1,2}= frac{-b+-sqrt{D} }{2a} = frac{-11+-1}{30} \x_{1}=-frac{1}{3}\x_{2}=-0,4\\7x^{2}-3x=0\x(7x-3)=0\x_{1}=0 \7x-3=0\7x=3\x_{2}=frac{3}{7}$