Question

Решить уравнения:
1) 10 x^{2} +5 х=0
2) 12 x^{2} +3х=0
3) 25-100 x^{2} =0
4) 4-36 x^{2} =0
5) 2 x^{2} -14=0

Answer 1

$1) 10 x^{2} +5 x=0\ 5x(2x+1)=0\ x=0;qquad 2x+1=0;\ x=0;qquad x=-0,5\ \ 2) 12x^2+3x=0\ 3x(4x+1)=0\ x=0;qquad 4x+1=0\ x=0;qquad x=-1/4\ \ 3) 25-100x^2=0\ x^2= 0,25\ x=pm 0.5\ \ 4)4-36x^2=0\ x^2=9\ x=pm 3\ \ 5) 2x^2-14=0\ x^2=7\ x=pmsqrt{7}$