3x²+39x=0 b)x²+7x+10=0
1) 3x²+39x=0 3x(x+13)=0 x1=0 x2= - 13 2) x²+7x +10=0 D² = 49-40=9 D=+-√9=+-3 x1=(-7-3)/2= - 5 x2= (-7+3)/2 = - 2
3x²+39x = 0 x²+7x+10 = 0 3x(x+13) = 0 x₁= -2 x₂= -5 x₁=0 x₂= -13