B. if a = 1, use reverse foil or trial and error method

x² + 7x + 12 = (x + 3)(x+4)
x² - 7x + 12 = (x - 3)(x-4)
x² + 3x - 18 = (x + 6)(x - 3)
x² - 3x - 18= (x-6) (x + 3

pls answer ​