Question

х²-11х+30=0
  и еще 0,04-х²=0

Answer 1

$1) x^{2} -11x+30=0 \ D=121-120=1 \ sqrt{D} =1 \ x_{1} = frac{11+1}{2} = frac{12}{2} =6 \ x_{2} = frac{11-1}{2} = frac{10}{2} =5$

$0.04- x^{2} =0 \ (0.2-x)(0.2+x)=0 \ 0.2-x=0\x=0.2 \ \ 0.2+x=0\x=-0.2$