Which expression is equivalent to (f + g)(4)?

false

step-by-step explanation:

false : it can not go to 9 the highest that part can go is 7

here is your proof

answers

\3. yes the presentation (i.e. odd numbers being written as differences of two squares) is possible for all odd natural number however the presentation may not be unique. for example,  57=112−82=292−28257=112−82=292−282.

\4. 2 can't be written as a difference of two squares because 4-1=3 and 1-1=0 and the difference of squares grows to integers larger that 3.

can i get some in proving questions 1 and 2?

step-by-step explanation: