What are the x-intercepts of the graph of y = x2 + 7x + 12?

Hello : 
 the x-intercepts of the graph of y = x2 + 7x + 12 when : y=0
x²+7x+12=0
delta= b²-4ac    a= 1   b=7    c= 12
delta = (7)²-4(1)(12) =1 =1²
x1 = (-7 -1)/2 = -4
x2 = (-7+1)/2 = -3 
the x-intercepts of the graph of y = x2 + 7x + 12  : -4 and -3

1200 inches = 30 yards12 inches= 1 foot3 feet= 1 yard3feet= 36 inchesyou can set up a proportion then use inverse operations that looks sorry it looks so sloppy lol