2x-9=(x-3)(x+3)2x-9-(x^2-9)=02x-9-x^2+9=02x-x^2=0
D=2^2-4*(-1)*0=4
x1=(2-2)/(2*(-1))=-0/2=0x2=(-2-2)/(2*(-1))=4/2=2
2x-9=(x-3)(x+3)
2x-9-(x^2-9)=0
2x-9-x^2+9=0
2x-x^2=0
D=2^2-4*(-1)*0=4
x1=(2-2)/(2*(-1))=-0/2=0
x2=(-2-2)/(2*(-1))=4/2=2