Rewrite the equation by completing the square.
x^{2}+16x+63 = 0

(x+__)^2=__

Step-by-step explanation:

x² + 16x + 63 = 0

x² + 16x = -63

To complete the square, add (16/2)² = 64 to both sides.

x² + 16x + 64 = -63 + 64

(x + 8)² = 1

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.