Step-by-step explanation:
Actually, it isn't that hard. Remember the difference of squares? (a + b)(a - b) = a² - b² and in this case 9 is a and 4x is b so our answer is 81 - 16x².
Answer:
4444444444444444
Step-by-step explanation:
44444444
20 goes in to 8 2.5 times
30:240 simplified gives you 3:8
So the ratio is 3:8