You're standing there at the edge of the answer but you're afraid to jump in. Take a long hard look inside the parentheses. Stare at it and don't blink.
Isn't 4n^2. a square ? Isn't. 9. a square ? Is that so ! Then isn't (4n^2 - 9) the difference of squares ! ? ! Go ahead. Take the plunge.
A=5/2-1/2b is equal to 4a+2b=10
Answer:

Step-by-step explanation:
Answer:
write the question properly and <u>completely</u> then only you will get correct answer
Answer: 17
21-4=17
4+17=21
21+17=38 and so on..