expand and simplifiy {x-3} {x-6}
(x-3)(x-6)=x^2-6x-3x+18=x^2-9x+18
(x - 3)(x - 6)= x(x - 6) - 3(x - 6) = xx - 6x - 3x - 3-6= x² - 6x - 3x + 18= x² -9x + 18Hope this explains it.