Divide and Check.

6x⁴ - 2x² + 5

Step-by-step explanation:

[48x⁵ - 16x³ + 40x] ÷ 8x

[8x(6x⁴ - 2x² + 5)] ÷ 8x

6x⁴ - 2x² + 5

Check:

(6x⁴ - 2x² + 5)(8x)

= 48x⁵ - 16x³ + 40x (verified)

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.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225