Question

Peshite ypaBnenie x+6*(x-18)

Answer 1

x+6·(x-18)=0
x²-18x+6x-108=0
x²-12x-108=0
D=12²-4·1·(-108)=144+432=576
√D=24
x₁=$\frac{12+24}{2}=18$
x₂=$\frac{12-24}{2}=-6$